Evolution
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Evolution is a change in heritable traits of biological organisms over generations due to natural selection, mutation, gene flow, and genetic drift. Also known as descent with modification. Over time these evolutionary processes lead to the formation of new species (speciation), changes within lineages (anagenesis), and loss of species (extinction). “Evolution” is also another name for evolutionary biology, the subfield of biology concerned with studying evolutionary processes that produced the diversity of life on Earth.
Broadly defined, biological evolution is any heritable change in a population of organisms over time. Changes may be slight or large, but must be passed on to the next generation (or many generations) and must involve populations, not individuals.

Evolution