"Insects, being so small, do not have oxygen-carrying bloodstreams. What little oxygen their cells require can be absorbed by simple diffusion of air through their bodies. But being larger means an animal must take on complicated oxygen pumping and distributing systems to reach all the cells."
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Original Language: English
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J.B.S. Haldane in On Being the Right Size (1926)
https://en.wikiquote.org/wiki/Arthropod
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Arthropod
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