1.
amniotic egg: an egg with a shell and internal membranes that keep the embryo moist
2.
amphibian: an ectothermic vertebrate that spends its early life in water and its adult life on land
3.
atrium: upper chamber of the heart that receives and holds blood that is about to enter the ventricle
4.
cartilage: a tissue that is more flexible than bone
5.
ectotherm: an animal whose body does not produce much internal heat
6.
endoskeleton: an internal skeleton
7.
endotherm: an animal whose body controls and regulates its temperature by controlling the internal heat it produces
8.
fish: a vertebrate that lives in the water and uses fins to move
9.
habitat: specific environment in which an organism lives
10.
kidney: organ that filters waste from the blood and produces urine
11.
reptile: an ectothermic vertebrate that lays eggs and has lungs and scaly skin
12.
swim bladder: an internal gas-filled organ that helps a bony fish stabilize its body at different water depths
13.
tadpole: larva of a frog or toad
14.
turtle: reptile whose body is covered by a protective shell made of ribs and backbone
15.
ventricle: lower chamber of the heart that pumps blood out of the heart
16.
vertebrae: small bones that make up the backbone
17.
vertebrate: an animal with a backbone
