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Anonymous
>>330840
I'd guessing the Amazon for land-based stuff, just right off the top of my head. The amount of arthropod diversity alone in rain forests is ridiculous, not to mention other invertebrates like worms.
As for atmospheric conditions, an increase in oxygen levels would be great for arthropods. About 250 million years ago the atmosphere was way more saturated with oxygen, and huge insects and whatnot were everywhere. Inversely, I'm pretty sure less oxygen would fuck over bugs and stuff due to how their respiratory systems are set up. They don't actively breath like mammals or reptiles, but instead have a sort of free-flow systems where air just drifts through. So less oxygen means way less activity for insects.
Of course, it would take a ton of extra oxygen to kill all humans, and at that point I think the atmospheric pressure would rape most everything. I'm not sure exactly what would be left, but it'd definitely be another win for roaches.
And as some other guy said, super low oxygen levels would eventually destroy tropical ecosystems and probably most marine ones, too. In the long run, the climate changes and havoc wreaked on ecosystems we take for granted due to lowered oxygen levels would probably get to us humans before the lack of oxygen itself would.
And after writing that all, I realized that I never gave you a straight-up answer to your question. I really can't specifically say what would be left alive under conditions that would kill mankind in its entirety.
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