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| all chordates share three characteristics: at some point in their development, they have a notochord, a nerve chord, and a pharyngeal slits |
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| a flexible rod that supports the animal's back |
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| a tissue that is softer than bone, but flexible and strong |
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| an internal skeleton that supports and protects the body, helps give it shape, and gives muscle a place to attach |
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an animal whose body does not produce much internal heat-its body temperature changes depending on the temperature of its environment
-most fishes, amphibians, and reptiles are ectotherms |
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| an animal whose body controls and regulates its temperaure by controlling the internal heat it produces through adaptations sucha s fur, feathers, or sweat glands |
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-most fishes, amphibians, and reptiles have a boby temperature that is close to the temperature of their environment
-birds and mammals have a stable body temperature that is typically much warmer than their environment |
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