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Evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs.The biodiversity of life evolves by means of natural selection, mutations and genetic drift. The process of natural selection is based on three conditions. First, every individual is supplied with hereditary material in the form of genes that are received from their parents; then, passed on to their offspring. Second, organisms tend to produce more offspring than the environment can support. Third, there are variations among offspring as a consequence of either the random introduction of new genes via mutations or reshuffling of existing genes during sexual reproduction.