2 stages of human evolution.

Evolution, in biology, or more specifically neo-Darwinian evolution, it the process of change in a species by natural selection. According to evolution everything started off as one single organism and over billions of years they have evolved into many new complex species. In some cases an animal can change almost completely until it is unrecognisable. Cordoning to evolution monkeys evolved into humans this way. It is controversial, mainly due to the religious problems with Common descent.

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