invertebrates

Question 1

vertebrates

Answer 1

an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.

Question 2

invertebrates

Answer 2

animals that neither possess nor develop a vertebral column, derived from the notochord.

Question 3

consumer

Answer 3

an organism that feeds on plants or other animals for energy.

Question 4

ganglion

Answer 4

a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.

Question 5

gut

Answer 5

an organ system within humans and other animals which takes in food, digests it to extract and absorb energy and nutrients, and expels the remaining waste as feces.

Question 6

coelom

Answer 6

the body cavity in metazoans, located between the intestinal canal and the body wall.

Question 7

bilateral symmetry

Answer 7

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

Question 8

radial symmetry

Answer 8

symmetry around a central axis, as in a starfish or a tulip flower.

Question 9

asymmetry

Answer 9

lack of equality or equivalence between parts or aspects of something.

Question 10

sponges

Answer 10

multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.

Question 11

Cnidarians

Answer 11

a phylum under Kingdom Animalia containing over 11,000 species of animals found exclusively in aquatic environments.

Question 12

flatworms

Answer 12

a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.

Question 13

roundworms

Answer 13

a diverse animal phylum inhabiting a broad range of environments.

Question 14

mollusks

Answer 14

soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

Question 15

Open circulatory system

Answer 15

Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.

Question 16

Closed circulatory system

Answer 16

Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness.

Question 17

annelid worms

Answer 17

a large phylum with over 22,000 extant species including ragworms, earthworms, and leeches.

Question 18

exoskeleton

Answer 18

a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.

Question 19

compound eye

Answer 19

a visual organ found in arthropods such as insects and crustaceans.

Question 20

antenna

Answer 20

either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods.

Question 21

Metamorphosis

Answer 21

the process of transformation from an immature form to an adult form in two or more distinct stages.

Question 22

endoskeleton

Answer 22

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Question 23

Water vascular system

Answer 23

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