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The thin - moist part of an animal where oxygen from the environment diffuses into living cells and carbon dioxide diffuses out to the surrounding environment - must be in contact with an environmental source of oxygen and must be large enough to tak

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1. The thin - moist part of an animal where oxygen from the environment diffuses into living cells and carbon dioxide diffuses out to the surrounding environment - must be in contact with an environmental source of oxygen and must be large enough to tak





 
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