Science - Chapter 16

Front 1

vertebrate

Back 1

an animal with a skull and a backbone; includes mammals, birds, reptiles, amphibiams, and fish

Front 2

vertebrae

Back 2

segments of bone or cartilage that interlock to form a backbone

Front 3

endotherm

Back 3

animal that maintains a constant body temperature despite temperature changes in its environment

Front 4

ectotherm

Back 4

an animal whose body temperature fluctuates with the environment's temperature

Front 5

fins

Back 5

fanlike structures that help fish move, turn, stop, and balance

Front 6

scales

Back 6

bony structures that cover the skin of bony fishes

Front 7

lateral line system

Back 7

a row or rows of tiny sense organs along the sides of a fish's body

Front 8

gills

Back 8

organs that remove oxygen from the water and carbon dioxide from the blood

Front 9

denticles

Back 9

small, sharp, toothlike structures on the skin of cartilaginous fishes

Front 10

swim bladder

Back 10

a ballonlike organ that is filled with oxygen and other gases; gives bony fish their buoyancy

Front 11

lung

Back 11

a scalike organ that takes oxygen from the air and delivers it to the blood

Front 12

tadpole

Back 12

the aquatic larvae of an amphibian

Front 13

metamorphosis

Back 13

the process in which an insect or other animal changes form as it develops from an embryo or larva to an adult

Front 14

therapsid

Back 14

a prehistoric reptile ancestor of mammals

Front 15

amniotic egg

Back 15

an egg containing amniotic fluid to protect the developing embryo; usually surrounded by a hard shell