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| egg covered with a shell that provides a complete environment for the embryo's development |
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| tough, flexible tissue that joins vertebrae and makes up all or part of the vertebrate endoskeleton |
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| animal that has a notochord, a nerve cord, pharyngeal pouches, and a postanal tail present at some stage in its development |
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| vertebrate animal whose internal temperature changes when the temperature of its environment changes |
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| supportive framework of bone and/or cartilage that provides an internal place for muscle attachment and protects a vertebrate's internal organs |
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| vertebrate animal with a nearly constant internal temperature |
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| inactivity in hot, dry months |
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| structure used by fish for steering, balancing, and movement |
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| inactivity in cold weather |
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| tubelike structure above the notochord that in most chordates develops into the brain and spinal cord |
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| firm but flexible structure that extends along the upper part of a chordate's body |
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| in developing chordates, that paired openings found in the area between the mouth and digestive tube |
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| muscular structure at the end of a developing chordate |
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| thin, hard plate the covers a fish's skin and protects its body |
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