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| flexible rod that supports the animals back |
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| a phylum whose members have a notochord, a nerve cord, and slits in their throat area at some point in their lives |
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| connective tissue that is softer than bone, but flexible and strong |
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| bone that makes up the backbone of an animal |
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| internal skeleton which supports and protects the body, helps give it shape, and gives muscles a place to attach |
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| animal whose body does not produce much internal heat, its body temperature changes depending upon the temperature of the enviroment |
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| animal whose body controls and regulates its temperature by controlling the internal heat it produces |
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| hardened remains or other evidence of a living thing that existed a long time in the past |
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| made of hardened layers of sediments-particles of clay, sand, mud or silt |
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| vertebrate that lives in the water and has fins which are structures used for moving |
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| internal gas-filled sac that helps the fish stabilize its body at different depths |
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| force the water exerts upward on any underwater objecdt |
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| ectothermic vertebrate that spends its early life in water and adulthood on land |
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| two upper chambers of the heart which receive blood |
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| lower chamber of heart which pumps blood out to lungs and body |
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| specific environment in which an animal lives which also provides the things the animal needs |
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| ectothermic vertebrate that has lungs and scaly skin |
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| watery fluid produced by the kidneys that contains urea and other waste materials |
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