What are two major components of the theory of evolution by natural selection that have been added since Darwin’s time?. Earth & Marine Sciences

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  4. What are two major components of the theory of evolution by natural selection that have been added since Darwin’s time?

Darwin did know about sexual selection, a special form of natural selection. But he knew nothing about the inheritance of genetic molecules (genes on chromosomes) or the random events that can alter the genetic makeup of populations, now known as genetic drift.

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