Evolution

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Adaptation
Genetic drift
Gene flow
Mutation
Natural selection
Speciation

Introduction
Evidence
Evolutionary history of life
History
Level of support
Modern synthesis
Objections / Controversy
Social effect
Theory and fact

Cladistics
Ecological genetics
Evolutionary anthropology
Evolutionary development
Evolutionary psychology
Molecular evolution
Phylogenetics
Population genetics
Systematics

Evolution (also known as biological, genetic or organic evolution) is the change in the inherited traits of a population of organisms through successive generations.[1] This change results from interactions between processes that introduce variation into a population, and other processes that remove it. As a result, variants with particular traits become more, or less, common. A trait is a particular characteristic—anatomical, biochemical or behavioural—that is the result of gene–environment interaction.

The main source of variation is mutation, which introduces genetic changes. These changes are heritable (can be passed on through reproduction), and may give rise to alternative traits in organisms. Another source of variation is genetic recombination, which shuffles the genes into new combinations which can result in organisms exhibiting different traits. Under certain circumstances, variation can also be increased by the transfer of genes between species,[2][3] and by the extremely rare, but significant, wholesale incorporation of genomes through endosymbiosis.[4][5]

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