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Darwin

Short and memorably answer.

Natural selection is the nonrandom survival and reproductive success of randomly varying organisms.

Natural selection is the main driver of adaptive change leading to evolution.

Read more: What_is_the_theory_of_natual_selection

Added:

The nonrandom survival and reproductive success of randomly varying organisms.

All organisms are variations. More organisms are born than can possible survive on the resources available. Those organisms that vary in ways that aid their survival and reproduction, over other organisms whose variations do not aid them to do these things, are selected and their genes become well represented in the population while the disadvantageous genes become less well represented. Also the characteristics must be heritable

Read more: Explain_the_Theory_of_Natural_Selection

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12y ago

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