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darwin popularised the term "natural selection", contrasting it with artificial selection , which in his view is intentional, whereas natural selection is not. variation exists within all populations of organisms . this occurs partly because random mutations arise in the genome of an individual organism
, and their offspring can inherit such mutations. throughout the lives of the individuals, their genomes interact with their environments to cause variations in traits. the environment of a genome includes the molecular biology in the cell , other cells, other individuals, populations, species , as well...
https://en.wikipedia.org/wiki/Selection_(biology)