Cambrian and Ordivician

Question 1

Clams are an example of the mollusk body plan specialized for this type of feeding.

Answer 1

Filter

Question 2

Cnidarians remove undigested food from the gastrovascular cavity through this opening.

Answer 2

Mouth

Question 3

Planaria feeds by using this structure to get food into its digestive tract.

Answer 3

Pharynx

Question 4

The ancestral echinoderms tube feet were originally used for this.

Answer 4

Feeding

Question 5

These cover the surface of a bryozoan’s tentacles.

Answer 5

Cilia

Question 6

This type of skeleton is found in Ecdysozoans.

Answer 6

Exoskeleton

Question 7

The type of symmetry characteristic of cnidarians.

Answer 7

Radial

Question 8

In an echinoderm the tip of the tube toot uses this to help it attach to the substrate.

Answer 8

Suction

Question 9

Like corals, these animals built reefs on the Ordovician Oceans.

Answer 9

Bryazoa

Question 10

A free living flatworm’s mouth is located on the side of the animal.

Answer 10

Ventral

Question 11

The number of muscle layers in a nematode.

Answer 11

One

Question 12

most echinoderms have this number of arms.

Answer 12

Five

Question 13

With two different body types, we refer to the life cycle of cnidarians as being this.

Answer 13

Dimorphic

Question 14

Because onychophorans are active at this time of the day they are considered to be.

Answer 14

Nocturnal

Question 15

This is the sessile in the cnidarian cycle.

Answer 15

Polyp

Question 16

Metameres in a worm are also called there.

Answer 16

Segments

Question 17

This arthropod was abundant during the Cambrian and although it survived into the Ordovician it is now extinct.

Answer 17

Trilobite

Question 18

Burrowing worms consume what they burrow through and that makes them this type of feeder.

Answer 18

Substrate

Question 19

In a mollusk, the edge of this tissue secretes the shell and creates the cavity that bears its name.

Answer 19

Mantle

Question 20

Stage of a fluke life cycle that swims to either its vertebrate host or another vertebrate host were it encysts.

Answer 20

Cercaria

Question 21

Bryozoans get their common name from these plants, which they look like.

Answer 21

Moss

Question 22

Name of the ciliated larval stage in the cnidarian life-cycle.

Answer 22

Planula

Question 23

The sperm duct transports gametes from this organ to the seminal vesicle.

Answer 23

Testes

Question 24

This is the mobile floating, or swimming stage in the cnidarian life cycle.

Answer 24

Medusa

Question 25

These large tubes help supply air to inset tissues that require oxygen.

Answer 25

Trachea

Question 26

Extensions of these cells connect the nervous systems of a nematode.

Answer 26

Muscle

Question 27

This fluid-filled cavity forms the hydrostatic skeleton of a nematode.

Answer 27

Pseudo coelom

Question 28

These flatworm parasites always have a mollusc, usually a snail, as a part of their complex life cycle.

Answer 28

Flukes

Question 29

Specialized sponge cells can, if required dedifferentiate and became anoebocytes once again and after that specialize once again for different functions. The cells referred to as having this characteristic.

Answer 29

Totipotent

Question 30

echinoderms have this special type f radial symmetry.

Answer 30

Pentaradiate

Question 31

Crustacea, very important in marine environments because of what they feed on, are described as being this.

Answer 31

Herbivores

Question 32

The side of the medusa opposite the mouth is the referred to as this surface or side.

Answer 32

Aboral

Question 33

Some of the animals in the Lophotrochozoa have a unique feeding structure, what is the name of this structure.

Answer 33

Lophophore

Question 34

Even though onychophora have a chitinous cuticle they have this type of skeleton.

Answer 34

Hydrostatic

Question 35

The tremendous array of molluscan body plans is an excellent example of this type of radiation.

Answer 35

Adaptive

Question 36

This type of movement used by nematode sperm.

Answer 36

Amoeboid

Question 37

This fluid provides the hydro in the hydrostatic fluid in worms.

Answer 37

Coelomic

Question 38

The main locomotory structures used by echinoderms.

Answer 38

Tubefeet

Question 39

There are thousands of these on the surface of the radula, and they can scrape, pierce, tear, or cut at a mollusc’s food.

Answer 39

Teeth

Question 40

These filter feeding, and the simplest of animals architectures, appear prior to the Cambrian period.

Answer 40

Sponges

Question 41

The bristles, or hairs of annelids.

Answer 41

Setae

Question 42

Sponges are organized at the cellular grade and don’t have cells organized as these.

Answer 42

Tissue

Question 43

A cnidarian gastrovascular cavity is described as incomplete because it lacks this. В простонородье жопа.

Answer 43

Anus