Quote:
Originally Posted by Knalus
It took life on Earth 4 billion years to evolve to the point of multicellular life, and 4.5 billion to evolve intelligence as we know it. It's just as difficult for us to wrap our brains around the shear length of time certain things take to happen.
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Those aren't linear events though.
Mass extinctions play perhaps the largest role in shaping ecosystems and evolution.
Billions of years is lots of time for cataclysmic biological resets.
P.S. That is reasoning on my part, I am not a scientist.