Best & least-well adapted flora & fauna in a high-Oxygen atmosphere

Positing a high (c. 35%) Oâ‚‚-level on a roughly Earth-equivalent planet (atmosphere about like the early Carboniferous), what types of lifeforms would flourish?

Obviously, giant insects could be possible, but there's no need to assume Earth-like evolution.

And what about fish? Would something like Rhizodontia be possible/probable? They're from an earlier epoch here on Earth, but could they not have survived? Any advantage/disadvantage to different marine species given the high atmospheric Oâ‚‚?

Also, I'm particularly interested in the development of two other organisms: fungi and aspens. Any thoughts about their respective susceptibilities to high-Oâ‚‚ environments?

posted over 7 years ago

fbonzo‭

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