Ch. 27-29 Animals Flashcards

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1
Q

animals

A

develop through embryonic stages most are motile during at least part of their life cycle

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2
Q

radial symmetry

A

no front/ back or left/right

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3
Q

bilateral symmetry

A

2 sided symmetry

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4
Q

ectoderm

A

germ layer covering the embryos surface

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5
Q

endoderm

A

innermost germ layer and lines the developing digestive tube called the archenteron

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6
Q

mesoderm

A

third germ layer that fills the space between the ectoderm and the endoderm in bilaterally symmetric animals

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7
Q

sponges

A

porifera
lack true tissues
choanocytes

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8
Q

cnidarians

A

cnidarian

jellies, sea anemones

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9
Q

flatworms

A

platyhelminthes

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10
Q

protostone

A

organism where first opening to digestive system that develops is the mouth

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11
Q

annelids

A

annelida

earthworms

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12
Q

mollusks

A

mollusca

bivalves, gastropods

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13
Q

mantle

A

an extension of the body mass that drapes back on itself like a skirt and covers the mantle cavity, secretes the shell in species with a shell

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14
Q

gastropod

A

mollusk that moves about on its enlarged foot

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15
Q

bivalve

A

filter feeders, oysters, mussels

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16
Q

cephalopod

A

predatory, jet propulsion

squids, octopus, cuttlefish

17
Q

deuterostome

A

organism whose first opening to digestive system that develops is the anus

18
Q

roundworms

A

nematoda

free living or parasytes

19
Q

arthropod

A

arthropoda

arachnids, exoskeletons

20
Q

cuagulogen

A

forms goey substance to prevent spread of bacteria

21
Q

echinoderms

A

echinodermata
sea stars
water vascular system

22
Q

chordates

A

chordata
notochord extends length of body
dorsal hollow nerve cord paralleles notocord

23
Q

invertebrate chordates

A

lancelots

tunicates

24
Q

amniote

A

eggs in land tetrapods

reptiles, mammals, birds

25
Q

for amphibians fertilization is

A

external, eggs and sperm released in water

26
Q

amniotes

A

first vertebrates that had internal reproduction

didnt need water

27
Q

ectotherm

A

cold blooded

heat from environment

28
Q

endotherm

A

warm

produce own heat

29
Q

birds have a

A

4 chambered heart

30
Q

monotremes

A

egg laying mammals

31
Q

marsupials

A

pouched mammals

32
Q

placental mammals

A

placenta

33
Q

anthropoids

A

include monkeys, people, apes

34
Q

hominins

A

humans and closest extinct relatives