Invertebrate Animal

Question 1

An animal that has a backbone.

Answer 1

Vertebrates

Question 2

An animal that does not have a backbone.

Answer 2

Invertebrates

Question 3

An organism that eats other other organisms or organic matter.

Answer 3

Consumer

Question 4

A mass of nerve cells.

Answer 4

Ganglion

Question 5

The digestive tract.

Answer 5

Gut

Question 6

A body cavity that contains the internal organs.

Answer 6

Coelom

Question 7

The property of being divisible into symmetrical halves on either side of a unique plane.

Answer 7

Bilateral Symmetry

Question 8

The property of being divisible into symmetrical halves on either side of a unique plane.

Answer 8

Radial Symmetry

Question 9

Lack of equality or equivalence between parts or aspects of something; lack of symmetry.

Answer 9

Asymmetry

Question 10

Any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or framework, occurring in large, sessile colonies.

Answer 10

Sponges

Question 11

An aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates.

Answer 11

Cnidarians

Question 12

Any of a phylum (Platyhelminthes) of soft-bodied usually much flattened acoelomate worms (as the planarians, flukes, and tapeworms) —called also platyhelminth.

Answer 12

Flatworms

Question 13

A related round-bodied unsegmented worm (as an acanthocephalan) as distinguished from a flatworm.

Answer 13

Roundworms

Question 14

An invertebrate of a large phylum that includes snails, slugs, mussels, and octopuses. They have a soft, unsegmented body and live in aquatic or damp habitats, and most kinds have an external calcareous shell.

Answer 14

Mollusks

Question 15

A circulatory system in which the circulatory fluid is not contained entirely within vessels; a heart pumps fluid through vessels that empty into spaces called sinuses.

Answer 15

Open circulatory system

Question 16

A circulatory system in which the heart circulates blood through a network of vessels that form a closed loop; the blood does not leave the blood vessels, and materials diffuse across the walls of the vessels.

Answer 16

Closed circulatory system

Question 17

The annelids (Annelida, from Latin anellus, “little ring”), also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches.

Answer 17

Annelid worms

Question 18

A hard, external, supporting structure.

Answer 18

Exoskeleton

Question 19

An eye composed of many light detectors.

Answer 19

Compound eye

Question 20

A feeler that is on the head of an invertebrate, such as a crustacean or an insect, and that senses touch, taste, or smell.

Answer 20

Antenna

Question 21

Also called transformation. A change in the form and often habits of an animal during normal development after the embryonic stage. Metamorphosis includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog.

Answer 21

Metamorphasis

Question 22

An internal skeleton made of bone and cartilage.

Answer 22

Endoskeleton

Question 23

A network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.

Answer 23

Water vascular system