Is Adaptation the only Driver of Evolution?

Is Adaptation the only Driver of Evolution?

If evolution is driven by something that allows life to change over mere thousands, or even just hundreds, of years why are species not even more diverse than they are now? What eventually restricts the diversity of life on Earth?

Whether sexual preference selection, autonomous genetic change, temporary epigenetic adaptation eventually influencing long-term genetic adaptation, a combination of all these or something else allows species to evolve, what stops them from evolving beyond a certain point?

Fact is, nothing can survive unless its environment allows it. A human cannot live unsupported in the Antarctic or in the bubbling caldera of a volcano; it is not adapted to survive in such environments. In the end, adaptations that allow species to survive in their natural environment is the endgame.

Asking whether there are influences on evolution other than adaptation by natural selection is just tweaking. Darwin was right about the ultimate influence on evolution: it is the natural environment.

Except for one species, as far as we know, unless individuals of a species fit into their natural environment they are destined for failure. Unless a species can adapt to a changing environment it is destined for extinction. In evolution, the environment is king.

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