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How humans inhale and exhale. Clip art: <a href="http://www.clipart.dk.co.uk/457/subject/Biology/Breathing">DK Images</a>
How humans inhale and exhale. Clip art: DK Images

Natural Selections: the evolution of breathing

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All creatures breathe in some fashion, but how the job gets done has changed from fish to amphibian to reptile to mammal. Curt Stager and Martha Foley chart the evolution of animal respiration.

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