3 ms·
The oxygen level is only a single factor here, there are probably many more that influenced the size.
by forgotmypassw 11y ago
The oxygen level is only a single factor here, there are probably many more that influenced the size.
- JumpCrisscross 11y agoThere'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.