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The top documents tagged [posterior air sacs]
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posterior air sacs
Comp.physio. practical exam
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Respiration. Primitive Gas Exchange Diffusion is the order of the day! Organisms allow gas diffusion to occur across the membrane into the outer environment.
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Birds Copyright © McGraw-Hill Education Characteristics of Birds Birds have adaptations to generate their own body heat internally, feathers, and lightweight.
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Ornithology :D
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Feb 14, 2013
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