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Biology 104 - UNBC > Chapter 27 - Animals > Flashcards

Chapter 27 - Animals Flashcards

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1
Q

How many living species of animals have been identified?

A

1.3 million

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2
Q

“The animal kingdom extends far beyond
humans and other animals we may encounter”
True or False?

A

True

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3
Q

Are animals heterotrophic or autotrophic?

A

Heterotrophic

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4
Q

How do animals consume nutrients?(Not specific nutrition mode)

A

They ingest their food

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5
Q

Are animals multicellular or unicellular?

A

Multicellular

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6
Q

What domain do animals belong to?

A

Eukarya

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7
Q

What do animals cells lack that plant cells have? (1)

A

They lack cell walls

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8
Q

How are animal bodies held together?

A

By structural proteins

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9
Q

What is one kind of structural protein?

A

Collagen

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10
Q

What two tissues are unique to animals?

A

Nervous tissue and muscle tissues

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11
Q

How do most animals reproduce?

A

Sexually

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12
Q

What stage dominates the animal life cycle?

A

The diploid stage

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13
Q

What percentage of the animal kingdom is extinct? (Species)

A

99% of species

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14
Q

What is greater in the animal kingdom, the diversity if living species or the diversity of extinct ones?

A

The diversity of extinct species

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15
Q

In what time range did the common ancestor of living animals and choanoflagellates live?

A

Between 675 to 875 million years ago

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16
Q

How do zoologists categorize animals?

A

They categorize them by body plan

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17
Q

What is a body plan?

A

A set of morphological and developmental traits

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18
Q

What is one defining category of an animal’s body plan?

A

Symmetry or a lack of symmetry

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19
Q

What kind of symmetry can animals have

A

Radial or bilateral

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20
Q

What 3 sets of positions occur with bilateral symmetry?

A

Dorsal and ventral
Right and left
Anterior and posterior

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21
Q

The organization of the animal’s …… can change the animal’s body plan.

A

Tissues

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22
Q

What are tissues?

A

A collection of specialized cells

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23
Q

How are tissue cells isolated?

A

They are isolated from other tissues by membrane layers

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24
Q

What layers are present during deveopment in animals and how many layers are there?

A

Germ layers

Three

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25
Q

What do the three germ layers give rise to? (2)

A

The tissues and organs of the animal embryo

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26
Q

Define: Ectoderm

A

The germ layer covering the embryo’s surface

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27
Q

Define: Endoderm

A

The archenteron

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28
Q

Define: Archenteron

A

The innermost germ layer lining the developing digestive tube

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29
Q

Define: Diploblastic

A

Animals with both an ectoderm and endoderm

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30
Q

Define: Triploblastic

A

Animals with ectoderm, endoderm, and mesoderm

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31
Q

Define: Mesoderm

A

Middle layer of the three germ layers

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32
Q

All bilaterians are…

a) Diploblastic
b) Autotrophic
c) Triploblastic
d) Symmetrical

A

c) Triploblastic

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33
Q

What do most triploblastic animals possess

A

A body cavity

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34
Q

What is a true body cavity called

A

A coelom

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35
Q

What are coelomates?

A

Animals that possess a true coelom

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36
Q

What two kinds of development categories can many animals be categorized as having?

A

Protostome

Deuterostome

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37
Q

Describe cleavage in Protostome development (2)

A

Spiral and determinate

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38
Q

Describe cleavage in Deuterostome development (2)

A

Radial and indeterminate

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39
Q

What three groups are Deuterostomes?

A

Echinoderms
Hemicordates
Chordates

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40
Q

Are most animals Protosomes or Deuterostomes?

A

Protosomes

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41
Q

What system is developed from the ectoderm?

A

The brain/nervous system

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42
Q

What is an acoelomate?

A

An animal with no body cavity separating gut and body wall

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43
Q

What is a pseudocoelomate?

A

An animal that has a body cavity but it isn’t fully lined by the mesoderm.

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44
Q

Which kind of development allows for the possibility of a cell breaking off in early cleavage and fully developing?

A

Deuterostome development

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45
Q

What is possible because of indeterminate cleavage?

A

Identical twins and embryonic stem cells

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46
Q

What hole comes first in Dueterostomes?

A

Ass

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47
Q

What hole comes first in Protosomes?

A

Mouth

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48
Q

What hole comes second in Deuterostomes?

A

Mouth

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49
Q

What hole comes second in Protosomes?

A

Bum!

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50
Q

How many phyla do zoologists recognize? (range)

A

30-40 phyla

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51
Q

What percent of animals are invertebrates?

A

95%

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52
Q

What kind of symmetry do Ctenophora have?

A

Radial symmetry

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53
Q

What do Ctenophores lack?

A

Nematocytes

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54
Q

How do Ctenophores expel waste?

A

Through anal pores

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55
Q

What do Ctenophores use instead of nematocytes?

A

Sticky filaments

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56
Q

What are two features of Ctenophores?

A

Meogla and feeding tenticles

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57
Q

How do Cteniphores expell their sperm and eggs?

A

Through their mouths

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58
Q

Are Ctenophores bioluminescent?

A

They often are

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59
Q

How do Ctenophores move?

A

By using cilia on plates

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60
Q

What kind of animals are sponges?

A

Sessile aquatic/marine animals

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61
Q

What do sponges lack?

A

True tissues and organs

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62
Q

What phylum are sponges

A

Porifera

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63
Q

True or False:

Most sponges are hermaphorodites

A

True

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64
Q

How do sponges feed

A

They suspension feed

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65
Q

What parts of a sponge assist with suspension feeding? (3)

A

Choabocytes
Osculum
Spongocoel

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66
Q

Describe the process of suspension feeding

A

Choanocystes move water through pores into the spongocoel and out through the osculum

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67
Q

What phylum is the oldest in the clade Eumetazoa?

A

Cnidaria

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68
Q

What clade does the phylum Cnidaria belong to?

A

Eumetazoa

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69
Q

What two forms have Cnidarians diversified into?

A

Sessile (polyp)

Motile (medusa)

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70
Q

What are three general groups of Cnidarians?

A

Jellies
Corals
Hydras

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71
Q

Describe the basic body plan of a Cnidaria

A

Sac with a central digestive compartment

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72
Q

What is the name of the central digestive compartment in Cnidarians?

A

Gastrovascular cavity

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73
Q

What is the function of the one opening on the Cnidarians?

A

It is a mouth and anus

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74
Q

How many tissue layers are present in Cnidarians?

A

2 layers

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75
Q

Are Cnidarians herbivores, omnivores, or carnivores?

A

Carnivores

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76
Q

How do Cnidarians capture prey?

A

With tentacles

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77
Q

What cells are found on the tentacles of Cnidarians and what are their 2 functions

A

Cnidocytes

Function in defense and capture of prey

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78
Q

What are nematocysts?

A

Specialized organelles within cnidocytes that eject a stinging thread

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79
Q

What kind of symmetry do Bilaterian animals have?

A

Bilateral symmetry

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80
Q

Bilaterian animals have …..blastic development

A

Triploblastic

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81
Q

What two groups fall under the clade Bilateria?

A

Protosomia

Deuterostomia

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82
Q

What two groups fall under Protosomia?

A

Lophotrochozoa

Ecdysozoa

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83
Q

What are some organisms considered to be Lophotrochozoa? (5)

A 
Ectoprocts
Brachiopoda
Flatworms
Molluscs
The annelids
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84
Q

Why do some organisms develop a lophophore?

A

For feeding

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85
Q

What kind of stage do some Lophotrochozoa go through?

A

Trochophore larval stage

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86
Q

What specific feature do Lophophorates have?

A

A lophophore

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87
Q

Describe a lophophore

A

A horseshoe-shaped, suspension-feeding organ with ciliated tentacles

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88
Q

Lophophorates include

the phyla:

A

Ectoprocta and Brachiopoda and

others

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89
Q

What is another name for ectoprocts and why?

A

Bryozoans because they resemble plants

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90
Q

What kind of animals are Ectoprocts? (social + body feature)

A

Colonial animals encased in an exoskeleton

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91
Q

What do some Ectoproct species do?

A

Build reefs

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92
Q

What do Brachiopods resemble uperficially

A

Hinge-shelled molluscs

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93
Q

What sets Brachiopods apart from hinge-shelled molluscs?

A

They have dorsal and ventral shells rather than lateral shells

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94
Q

Where do Platyhelminthes live?

A

In marine, freshwater, and damp terrestrial habitats

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95
Q

Although flatworms
undergo …..
development, they
are …..

A

triploblastic

acoelomates

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96
Q

Describe flatworms

A

They are flattened dorso-ventrally and have a gastrovascular cavity

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97
Q

What are tapeworms and what do they do?

A

They are parasitic flatworms that lack digestive systems, requiring them to gather nutrients from a host’s intestine

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98
Q

What is the common name of the phylum Nemertea?

A

Ribbon worms

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99
Q

Decribe Ribbon worms (Environment, how they eat, size…)

A

Marine
Carnivorous
Elongate and colourful
Usually less than 20cm but have been found up to 54m long

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100
Q

What organisms are included in the phylum Mollusca?

A 
Snails
Slugs
Oysters
Clams
Octopuses
Squids
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101
Q

What environment do molluscs inhabit? (3)

A

Marine habitats
Some fresh water
Some terrestrial

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102
Q

Describe the physical body of molluscs (really unspecific)

A

Soft-bodied, but most are protected by a hard shell

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103
Q

What 3 parts make up the general body plan of molluscs?

A

Muscular foot
Visceral mass
Mantle

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104
Q

What feature is common do many molluscs have?

A

Water- filled mantle cavity

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105
Q

What structure do molluscs use to feed?

A

Rasp-like radula

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106
Q

What are the four major classes of molluscs?

A

Chitons
Gastropods
Bivalves
Cephalopods

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107
Q

What class consists of chitons?

A

Polyplacophora

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108
Q

Describe chitons

A

Oval shaped marine animals encased in an armor of eight dorsal plates

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109
Q

Roughly what portion of all living species of molluscs are gastropods?

A

Three quarters

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110
Q

About three-quarters of all

living species of molluscs are…

A

Gastropods

111
Q

What class are bivalves?

A

Bivalvia

112
Q

What does bivalvia mean?

A

Shell in two halves

113
Q

What organisms are included in the class Bivalvia? (non-specific)

A

Clams
Oysters
Mussels
Scallops

114
Q

What class are Cephalopods?

A

Cephalopoda

115
Q

What organisms are included in the class Cephalopoda?

A

Squids
Nautili
Octopuses

116
Q

Describe cephalopods

A

Carnivores with beak-like jaws surrounded by tentacles of their modified foot

117
Q

Look at octopus slide

A

Weird wording

118
Q

What kind of hooks do squid suckers have?

A

Chitinous hooks

119
Q

Describe annelids

A

They have bodies composed of a series of fused rings

120
Q

What three classes is the phylum Annelida divided in to?

A

Oligochaeta
Polychaeta
Hirudinea

121
Q

What organisms are in the class:

a) Oligochatea
b) Polychaeta
c) Hirudinea

A

a) earthworms and their relatives
b) Polychaetes or marine worms
c) Leeches

122
Q

What are Oligochatea?

A

Terrestrial and aquatic worms named for their bristles of chitin or chaetae

123
Q

What do earworms eat and how do they extract nutrients

A

They eat soil, extracting nutrients as soil moves through the alimentary canal

124
Q

Desricribe members of the class Polychaetes

A

They have paddle-like parapodia that work as gills and help with locomotion

125
Q

Describe members of the class Hirudinea

A

Blood sucking parasites, predators, or scavangers

Secrete a chemical called hirudin to prevent blood coagulation

126
Q

What are ecdysozoans covered by?

A

A tough coat called a cuticle

127
Q

By what process is the cuticle shed or molted?

A

Ecdysis

128
Q

What are the two largest phyla of Ecdysozoans?

A

Nematodes

Arthropods

129
Q

What is another name for nematodes?

A

Roundworms

130
Q

Where are nematodes found? (4)

A

In most aquatic habitats, soil, moist tissues of plants, and in the body tissues and fluids of animals

131
Q

3 characteristics of nematodes

A

Internal fertilization
Alimentary canal
No circulatory system

132
Q

How many living species of velvet worms are there?

A

65

133
Q

What habitat do velvet worms inhabit

A

Terrestrial, moist, temperate, and tropical habitats in the southern hemisphere

134
Q

What are two features of velvet worms?

A

They have numerous paired legs and are superficially segmented

135
Q

Do velvet worms bear live young?

A

Yes

136
Q

… out of every … species of animals are anthropods.

A

Two

Three

137
Q

Where are members of the phylum Arthropoda found? (broad)

A

Nearly all habitats of the biosphere

138
Q

Describe anthropods (2)

A

Covered in an exoskeleton made of proteins and chitin

Molt exoskeleton as they grow

139
Q

What kind of circulatory system do anthropods have?

A

An open circulatory system

140
Q

What fluid is found in the circulatory system of anthropods and where does it circulate?

A

Hemolymph

Circulated into the spaces surrounding the tissues and organs

141
Q

What are a variety of organs specialized for in anthropods?

A

Gas exchange

142
Q

What is the subphylum of Cheliceriforms?

A

Cheliceriformes

143
Q

What are Cheliceriforms named for?

A

Claw like feeding appendages called chelicerae

144
Q

Earliest cheliceriforms?

A

Eurypterids (sea scorpions)

145
Q

Most marine cheliceriforms are … but some species survive today, including … and …

A

Extinct
Horseshoe crabs
Sea spiders

146
Q

Most modern cheliceriforms are …

A

Arachnids

147
Q

What are 4 examples of arachnids?

A

Spiders
Scorpions
Ticks
Mites

148
Q

Describe the body structure of Arachnids

A

Abdomen
Cephalothorax
Book Lungs
Specialized abdominal glands

149
Q

What are the appendages found on the cephalothorax and what are their names?

A

Six pairs of appendages
Chelicerae
Pedipalps
Legs

150
Q

What do many spiders produce?

A

Silk, a liquid protein

151
Q

What group of animals has mainly remained in marine and freshwater environments?

A

Crustaceans

152
Q

What is the subphylum of Crustaceans?

A

Crustacea

153
Q

Describe a typical crustacean

A

Branched appendages,

Seperate male and female parts

154
Q

What do crustaceans use their branched appendages for?

A

Feeding and locomotion

155
Q

Isopods include what three species? (non-specific)

A

Terrestrial
Freshwater
Marine

156
Q

What is a well known group of terrestrial isopods?

A

Pill bugs!

157
Q

What group are relatively large crustaceans?

A

Decapods

158
Q

What are 4 examples of decapods?

A

Lobsters
Crabs
Crayfish
Shrimp

159
Q

What subphylum includes millipedes and centipedes?

A

Myriapoda

160
Q

Describe Myriapods

A

Terrestrial with jaw-like mandibles

161
Q

Millipedes are … that eat decaying plant matter

A

Detritivores

162
Q

What does each truck segment of millipedes have?

A

2 pairs of legs

163
Q

Centipedes are what kind of heterotroph?

A

Carnivores

164
Q

How many leg pairs do they have per trunk segments?

A

One pair per trunk segment

165
Q

What subphylum has more species than all other life forms combined?

A

Hexapoda

166
Q

Where do hexapoda live?

A

In almost every terrestrial habitat and in fresh water

167
Q

What does the internal anatomy include? (non-specific)

A

Several complex organ systems, such as light organs

168
Q

What organisms are know for their light organs????

A

Fireflies!!!

169
Q

What are the advantages that an animal that flies has (3)

A

Escape predators
Find food
Disperse to new habitats much faster

170
Q

What did flight allow for with respect to palnts?

A

Feeding o gymnosperms and co-evolution with angiosperms

171
Q

What two diversity griups declined during the Cretaceous extinction?

A

Insect and plant

172
Q

How long has insect and plant diversity been increasing?

A

65 million years (since the Cretaceous extinction)

173
Q

Sea stars and other echinoderms are from the phylum?

A

Echinodermata

174
Q

What phylum do Echinodermata seem to have little in common with?

A

The phylum Chordata, including vertebrates

175
Q

Echinodermata are

a) Protosomes
b) Flagellates
c) Deuterostomes
d) Anteaters

A

c) Deuterostomes

Pls don’t say anteaters

176
Q

Chordates share many features of embryonic development with…

A

Echinoderms and acorn worms

177
Q

How long have Chordates been evolving seperately?

A

At least 500 million years

178
Q

All chordates share a set of …

A

Derived characters

179
Q

Some species of chordates only have derived character traits during what stage of development?

A

Embryonic development

180
Q

Four key characteristics of chordates

A

Notochord
Dorsal, hollow nerve chord
Pharyngeal slits or clefts
Muscular, post-anal tail

181
Q

What is the notochord?

A

A longitudinal, flexible rod made of fluid-filled cells surrounded by tough connective tissues between the digestive tube and nerve chord

182
Q

What does the notochord do?

A

It provides skeletal supports throughout most of the length of a chordate

183
Q

Do most vertebrate adults have a notochord?

A

No, they just retain the remnants of the embryonic notochord

184
Q

What kind of skeleton forms in vertebrates with respect to chordates?

A

A more complex, jointed skeleton

185
Q

In chordates, pharynx grooves are called … and they develop into … that …

A

Pharyngeal clefts
Slits
Open to the outside of the body

186
Q

What are the three function of the pharyngeal slits?

A 
Suspension-feeding structures in many
invertebrate chordates
– Gas exchange in vertebrates (except
vertebrates with limbs, the tetrapods)
– Develop into parts of the ear, head, and neck
in tetrapods
187
Q

What do chordates have posterior to the anus

A

A tail

188
Q

In many species of chordates the tail is greatly reduced during …

A

Embryonic development

189
Q

What does the chordate tail contain? (2)

A

Skeletal elements and muscles

190
Q

What does the chordate tail do?

A

It provides a propelling force in many aquatic species

191
Q

What are lancelets named for?

A

Their blade-like shape

192
Q

What group do Lancelets belong to?

A

Cephalochordata

193
Q

Describe Lancelets

A

Marine suspension feeders that have characteristics of the chordate body plan as adults

194
Q

What is the name for invertebrate chordates?

A

Tunicates

195
Q

Which is more closely related to other chordates, Tunicates or Lancelets?

A

Tunicates

196
Q

When do tunicates most resemble chordates?

A

During their laravl stage

197
Q

How long may a tunicate larval stage last?

A

Onl a few minutes

198
Q

What form do tunicates take on after their larval stage

A

One of a sessil, marine suspension feeder

199
Q

How do unicates eat as adults?

A

They filter food particles our of water which they draw in through an incurrent siphon

200
Q

Fossils from the … document the transition to craniates

A

Cambrian explosion 530 million years ago

201
Q

What are the two most primitive craniate fossils?

A

Haikouichthys and Myllokunmingia

202
Q

What distinct characteristics do craniates possess.

A

a skull,

brain, eyes, and other sensory organs

203
Q

What did the presence of a head allow chordates to begin to do

A

Hunt (active predation)

204
Q

In aquatic craniates the pharyngeal clefts evolved into …

A

Gill slits

205
Q

Craniates have a heart with …, red blood cells with … and …

A

At least two chambers
With hemoglobin
Kidneys

206
Q

What group is the least dervived survining craniate lineage?

A

Myxini (hagfish)

207
Q

What are characteristics of hagfish?

A

Hagfishes have a cartilaginous skull and axial rod
of cartilage derived from the notochord, but lack
jaws and vertebrae

208
Q

During wht peiod did craniates evolve into vertebrates

A

Cambrian period (approx. 525 mya0

209
Q

What are three dervived characteristics of vertebrates?

A

Vertebrae enclosing a spinal cord
An elaborate skull
Fin rays, in the aquatic forms

210
Q

Approximately how many species of vertebrates are there?

A

52,000

211
Q

What organism represents the oldest living lineage of vertebrates?

A

Lampreys (Petromyzontida)

212
Q

Describe lampreys

A

Jawless vertebrates
Live in marine and freshwater habitats
Have cartilaginous segments surrounding the notochord and some of the nerve chord
Oral disk

213
Q

What are Gnathostomes?

A

Jawed vertebrates

214
Q

What percentage of vertebrates are Gnathostomes?

A

99%

215
Q

What are two groups that are also Gnathostomes?

A

Placoderms

Chondrichthyans

216
Q

What are 4 examples of chondricthyans?

A

Sharks
Skates
Rays
Chimeras

217
Q

Describe a condrichthyan skeleton

A

They have a cartilaginous
skeleton that evolved
secondarily from an ancestral mineralized skeleton

218
Q

Condricthyans are … carnivores

A

Mostly fast swimming

219
Q

Are shark eggs fertalized externally or internally?

A

Internally

220
Q

Oviparous

A

eggs hatch

outside the mother’s body

221
Q

Ovoviviparous

A

the embryo
develops within the uterus
and is nourished by the egg
yolk

222
Q

Viviparous

A 
the embryo
develops within the uterus
and is nourished through a
yolk sac placenta from the
mother’s blood
223
Q

What group of gnathostomes do most vertebrates belong to?

A

Osteichthyes (boney fish)

224
Q

What three groups are Osteichthyes?

A

Bony fish
Lobefish
Tetrapods

225
Q

What group are we part of (general)

A

Jawed boney fish

226
Q

What do nearly all living osteichthyans have?

A

A bony endoskeleton

227
Q

What are aquatic osteichthyans informally called?

A

Fish

228
Q

How do most fish “breathe”?

A

by drawing water over

gills protected by an operculum

229
Q

How do fish control their boyancy?

A

Air sac! (swim bladder)

230
Q

What class are ray-finned fishes?

A

Class Actinopterygii

231
Q

What do Actinopterygii use their fins for?

A

Maneuvering, defense, and other functions

232
Q

What two features do Lobe-fins have?

A

Muscular pelvis

Pectoral fins

233
Q

What three lineages of lobe-fins survived?

A

coelacanths (Actinistia), lungfishes (Dipnoi),

and tetrapods

234
Q

What did some lobe-fins evolve?

A

Limbs and feet

235
Q

What specific adaptations do tetrapods have? (2)

A

– Four limbs, and feet
with digits
– Ears for detecting airborne sounds

236
Q

How many species of the class Amphibia are there?

A

6,150

237
Q

What does amphibian mean?

A

Both ways of life

238
Q

Amphibian … are aquatic and … are terrestrial

A

Larva

Adults

239
Q

How are amphibian eggs fertalized and what do they require?

A

Externally

Require moisture

240
Q

What aids amphibians in gas exchange?

A

Moist skin

241
Q

When did amphibians and amniotes split?

A

About 370 mya

242
Q

Describe amniotes

A

A group of tetrapods, more tolerant of dry conditions

243
Q

What organisms are amniotes?

A

Reptiles, such as birds and mammals

244
Q

Define: Anapsid

A

No holes in skull

245
Q

Define: Synapspid

A

One hole set in skull

246
Q

Define: Diapsid

A

Two hole sets in skull

247
Q

What 7 general groups are in the reptile clade?

A 
Tuataras 
Lizards
Snakes
Turtles
Crocodilians
Birds
Dinosaurs
248
Q

Two characteristics of reptiles

A

Scales that create a waterproof barrier

Shelled eggs laid on land

249
Q

The oldest reptilian fossil to date is

A

310 mya

250
Q

What was the first major group of reptiles to emerge?

A

Parareptiles

251
Q

Describe parareptiles

A

Large, stocky herbivores

252
Q

As parareptiles were dwindling, … were diversifying

A

Diapsids

253
Q

What are the two main lineages of diapsids?

A

Lepidosaurs and archosaurs

254
Q

What organisms are Lepidosaurs? (3)

A

Tuataras
Lizards
Snakes

255
Q

What organisms are archosaurs? (4)

A

Crocodilians
Pterosaurs
Dinosaurs
Birds

256
Q

Dinosaurs diversified into … and were …

A

Various shapes and sizes

Fast- moving

257
Q

What group was included in the dinosaurs?

A

Bipedal carnivores called theropods

258
Q

What group are birds?

A

Archosaurs

259
Q

What is the major adaptation of birds?

A

Wings with keratin faethers

260
Q

Other adaptations of birds are: (4)

A

lack of a urinary bladder,
females with only one
ovary, small gonads, and
loss of teeth

261
Q

How long ago did birds probably descend from theropdods?

A

150 mya`

262
Q

What is Archaeopteryx

A

The oldest known bird from sediments that are 150 myo

263
Q

How many species of mammals are there?

A

5,300

264
Q

All mammals have: (4)

A 
– Mammary glands, which produce
milk
– A relatively large brain
– Hair
– Differentiated teeth
265
Q

What did mammas evolve from and in what period?

A

Synapsids in the late Triassic period

266
Q

What three living lineages of mammals emerged by the early Cretaceous

A

Monotremes
Marsuprials
Eutherians

267
Q

“Mammals underwent a significant
adaptive radiation until after the Cretaceous”

True or false?

A

False

They did not

268
Q

Describe monotremes

A

Small group of egg-laying mamals consisting of the platypus and echidnas

269
Q

Describe marsupials

A

Mammals with develop in a placenta in a mothers uterus for a short time

270
Q

Examples of marsupials (3)

A

Opossums
Kangaroos
Koalas

271
Q

Where is embryonic development completed in marsupials?

A

In a maternal pouch, a marsupium

272
Q

Another name for eutherians is …

A

Placentals

273
Q

Placentals have a … pregnancy when compared to marsupials

A

Longer period of pregnancy

274
Q

Where do eutherians complete their embryonic development?

A

In the uterus, joined to the mother by a placenta

Biology 104 - UNBC (12 decks)

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