A lot of these answers I think missed a very important point.
Genes mutate, causing differences among a population and the genetic mutation that makes an organism better at sharing its genes(making more babies) will succeed over other mutations that are not as successful at replicating themselves. It is not that an organisms environment will lead to them being better suited to living in it, or that the fittest survive. It’s that the ones who are best at reproducing survive. Oftentimes those can be the same thing, but the root cause is different. Genes are selfish and just want to make sure they get passed down, not that the organism is best suited to its environment, or that the organism is “improving”.
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