Biologists had rarely found a step in evolution of adaptation that was not beneficial. The reproduction process also assisted evolution. Reproduction, not merely survival, was what determined the transfer of a gene into the next generation and ensured the genetic presence in the gene pool. When a person was older, the same genes could cause the production of wrinkles and enlarged prostate. We understand that natural selection also promoted reproduction. Adaptations always benefited the species involved and no other species. However the benefit part was not always true. Male lions or bonobo apes killed the offspring helping them get the females back for reproduction but the species as a whole suffered when numbers decreased.

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