Is it also possible that animals producing the CO2 going extinct is causing the drop in CO2 rather than the opposite?

What’s the mechanism for lower CO2 causing an extinction event? Animals do require CO2 in order to absorb oxygen via the Bohr effect [1] so it’s plausible but it would be nice to know the mechanisms.

1. https://en.m.wikipedia.org/wiki/Bohr_effect

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