Darwin Day is a celebration to commemorate the anniversary of the birth of Charles Darwin on 12 February 1809. The day is used to highlight Darwin's contribution to science and to promote science in general. Darwin came up with the idea of Natural Selection. This is the idea that the environment an organism lives in helps to determine which organisms survive and produce young, and which do not. He studied earthworms, orchids, pigeons and many other animals and plants, all the while working on a lengthy essay to explain and back up his idea of natural selection.

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