But the early world was a much more inhospitable place with the environment often changing very rapidly.
It was seaweed that first had sex.
They are a very diverse group, and they have remained very similar in appearance for 1.
So what were they and how did it all start?
What's more, the size of the protected area did not predict the rates of killing.
By far the most studied and debated example is our closest living relative:
When out-competing rivals and attracting partners in the struggle to reproduce, an individual has to be good at most things, so sexual selection provides an important and effective filter to maintain and improve population genetic health.
This is exactly what Goodall observed during the Gombe war:
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Why Skin Colors Differ.