evolution

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Introduction

A continuous process of change facilitated by the exchange of genetic material (sexual reproduction) & the pressure of natural selection.

↑ Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999
↑ Darwin C On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. John Murray, Albemarle Street. London. 1859
Wikipedia: On the Origin of Species https://en.wikipedia.org/wiki/On_the_Origin_of_Species