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All the species evolve the same way.

None of the species care about any specific "balance".

Humans are not destroying the planet (talk about hubris), but the biosphere and possibly the civilization.

I don't know about that. One species poisoned most other to death, a long time ago.

What species might that be?

There are five known big mass extinction events in Earth life history, the first one is caused by... drumroll... small plants. https://www.youtube.com/watch?v=mAkjETPM1s4

That lead me to this one, he's funny: https://www.youtube.com/watch?v=FlUes_NPa6M

That's because sooner or later every species enters an equilibrium state with the amount of energy available in the ecosystem. In the process it may out-compete quite a bit of other species, and so we speak of 'invasive species'.