Many examples that support the theory of evolution exist as the result of either artificial selection, which are typically, changes imposed by humans and natural selection which are typically changes imposed by enviornment.
Natural selection is a process that favors heritable traits that increase the survival chances of an organism, allowing the organism to reproduce more.
There are other types of selection, in addition to natural selection, that are out there in the world. Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection.
Darwin chose the term "natural selection" to be in contrast with "artificial selection," in which animal breeders select for particular traits that they deem desirable. In natural selection, it's the natural environment, rather than a human being, that does the selecting.
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