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Why do people and animals need to breathe? A biologist explains why you need a constant source of oxygen

  • Written by Christina S. Baer, Assistant Professor of Biological Sciences, Binghamton University, State University of New York
imageYour blood's natural limit to how much oxygen it can hold means you can't stockpile it.Lisa520/E+ via Getty Imagesimage

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Why do humans and animals have to breathe? – Tennessee, age 7, Hartford,...

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