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> Anyway, humans, compared to other animals we compete with for survival, food, and territory, are doing really well. I don't see any cows on the moon yet.

Would all this be possible without other mammals? Or is the ecosystem (including mammals) the enabler for us?

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Probably yes, but on a longer timeline. Humans don't need other mammals to survive.

Maybe not survival, but would we be anywhere near where we are now without the help of say, cows and horses? Possibly, but maybe not.

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