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Biology 15 Online
OpenStudy (anonymous):

4. The _________ of a fish can be toothlike, diamond-shaped, cone-shaped, or round. These structures are made of bone formed from the skin. (1 point) 5. Amphibians are ______________ because their body temperature changes with the temperature of the surroundings. (1 point) 6. The skeletons of lampreys, hagfishes, and sharks are made of a tough, flexible material called ______. (1 point)

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