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Fish, Reptiles, and Amphibians Vocabulary

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