Evolution in organisms occurs through changes in heritable characteristicsβ€”the inherited characteristics of an organism. In humans, for example, eye colour is an inherited characteristic and an individual Evolution is the process by which species change over time through the gradual accumulation of genetic variations, driven by mechanisms like natural selection, genetic drift, and Evolution helps us to understand the living world around us, as well as its history. Biological evolution is not simply a matter of change over time.

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