Lesson 24 Terms

Question 1

Anadromous

Answer 1

the animal is hatched in fresh water and then migrates to salt water as an adult

Question 2

Cartilage

Answer 2

strong connective tissue that supports the body and is softer and more flexible than bone

Question 3

Class Agnatha

Answer 3

jawless fish

Question 4

Class Amphibia

Answer 4

amphibian

Question 5

Class Aves

Answer 5

birds

Question 6

Class Chondrichthyes

Answer 6

cartilaginous fish; sharks, skates, rays

Question 7

Class Mammalia

Answer 7

mammals

Question 8

Class Osteichthyes

Answer 8

bony fish

Question 9

Class Reptilia

Answer 9

reptiles

Question 10

Dorsal hollow nerve cord

Answer 10

a bundle of nerve fibers running down the back

Question 11

Electroreception

Answer 11

sense electrical signals underwater; used to locate prey

Question 12

Endoskeleton

Answer 12

an internal frame made of bone or cartilage that provides support for the body

Question 13

Gastrointestinal tract

Answer 13

includes mouth at the anterior end of the animal and an anus at the posterior end

Question 14

Notochord

Answer 14

a rod-shaped structure that provides skeletal support; typically develops into a backbone

Question 15

Operculum

Answer 15

large flat gill covers that protect the gills

Question 16

Pharyngeal slits

Answer 16

connect the inside of the throat to the outside of the neck; develop into gills in aquatic animal

Question 17

Post-anal tail

Answer 17

an extension of the body past the anal opening

Question 18

Spawning

Answer 18

reproductive behavior; producing of eggs

Question 19

Spinal cord

Answer 19

a hollow tube of nervous tissue

Question 20

Subphylum Cephalochordata

Answer 20

lancelets

Question 21

Subphylum Urochordata

Answer 21

tunicate

Question 22

Subphylum Vertebrata

Answer 22

vertebrates

Question 23

Urogenital opening

Answer 23

opening where sperm and egg cells are released

Question 24

Vertebral column

Answer 24

backbone with a hollow tube of nervous tissue, known as the spinal cord