Animal Varieties Seen By Darwin

Darwin spent 3 1/4 years, (over 2/3 of his 4.8 Beagle voyage years), exploring on land, (18 months at sea).  He decided early that he could write a book about geology, and he showed a gift for theorising.  Darwin collected and made detailed observations of plants and animals, with some results disturbing his educated belief that species were stable fixed life forms.  Back in England, that provided the basis for ideas which came to him, leading to his good theory of evolution by natural selection.
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