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Life Sci - Chap 16

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Answer
vertebrate   animal that has a backbone  
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endotherm   animal that can use body heat from chemical reactions in the body's cells to maintain a constant body temperature  
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ectotherm   organism that needs sources of heat outside itself  
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lateral line   faint line visible on both sides of a fish's body that runs the length of the body and marks the location of sense organs that detect vibrations in the water  
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gill   respiratory organ where oxygen from the water is exchanged with carbon dioxide from the blood (fish)  
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swim bladder   in bony fishes, a gas-filled sac that is used to control buoyancy; also known as gas bladder  
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lung   respiratory organ where oxygen from the air is exchanged with carbon dioxide from the blood (non fish)  
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tadpole   aquatic, fish-shaped larva of a frog or toad  
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metamorphosis   phase in the life cycle of many animals during which a rapid change from the immature form of an organism to the adult form takes place  
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amniotic egg   type of egg that is surrounded by a membrane and that in reptiles, birds and egg-laying mammals contains a large amount of yolk and is surrounded by a shell  
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