The oxygen level is only a single factor here, there are probably many more that... | Hacker News

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forgotmypassw on Nov 13, 2015 | parent | context | favorite | on: How Insects Breathe

The oxygen level is only a single factor here, there are probably many more that influenced the size.

JumpCrisscross on Nov 13, 2015 [–]

There's compelling evidence for a causal link. Hundreds of millions of years ago the atmosphere was much more oxygen-rich than it is today. Insects were also far bigger.

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