Which process adds new genes to a gene pool

Question: Which process adds new genes to a gene pool?

The gene pool is the sum total of all the genes and combinations of genes that occur in a population… The composition of a population's gene pool can change over time through evolution. This can occur by a variety of mechanisms, including mutations, natural selection, and genetic drift. Also the Gene flow is also the answer for simpler answer.

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i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.