members of the chrodate phylum who have a notochord, a nerve chord, and slits in their throat area at some time in their lives
a flexible rod that supports the animal's back
a connective tissue that is softer than bone, but flexible and strong
many similar disc-shaped bones that form the backbone
an animal whose body does not produce much internal heat
an animal whose body controls and regulates its temperature by controlling the internal heat it produces
a vertebrate that lives in water and has fins
and internal gas-filled sac that helps the fish stabilize its body at different depths
the force that water exerts upward on any underwater object
an ectothermic vertebrate that spends its early life in water
two upper chambers of the heart
two lower chambers of the heart which pump blood out to the to the lungs and body
a specific environment in which an animal lives
an ectotherminc vertebrate that has lungs and scaly skin
a watery fluid that wastes are excreted in
the hardened remains or other evidence of a living thing that existed a long time in the past
the type of rock made of hardened layers of sediments--clay, sand, mud, or silt
the scientists who study extinct organisms
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