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| animal that at some time in its development has a notochord, nerve cord, and pharyngeal pouches |
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| internal system of bones that support and protect internal organs |
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| warm-blooded animal whose body temperature does not change with its surrounding environment |
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| cold-blooded animal whose body temperature changes with the temperature of its surrounding environment |
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| fanlike structures used by fish for steering, balancing, and moving |
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| type of feather that provides warmth |
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| tough, felxible tissue similar to bone but is softer and less brittle |
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| period of inactivity during cold weather; in amphibians, involves burying themselves in mud or leaves |
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| period of inactivity during hot, dry weather; in amphibians, involves moving to cooler, more humid areas underground |
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| vertebrate that spends part of its life in water and part on land |
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| adaption of reptiles that allows them to reproduce on land; encloses the embryo within a moist environment, protected by a leathery shell, and has a yolk that supplies the embryo with food |
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| lays hard-shelled eggs, has feathers, and is endothermic |
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| endotherm that has hair and produces milk to feed its young |
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| animal that eats both plants and animals |
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| mammal that gives birth to incompletely developed young that finish developing in their mother's pouch |
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| type of feather that provides coloring and streamlined shape |
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| vertebrates whose embryos develop in the uterus of the female |
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