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selection by humans for breeding of useful traits from the natural variation among different organisms
The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
organs that serve no useful purpose for the organism; these suggest that sometime in the past they were useful
evolution resulting from small specific genetic changes that can lead to a new subspecies
marked differences between the sexes in secondary sexual characteristics, which are not directly associated with reproduction
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