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→Inception of Darwin's evolutionary theory 达尔文进化论的诞生
[[File:Darwin Tree 1837.png|right|thumb|alt=A page of hand-written notes, with a sketch of branching lines.|In mid-July 1837 Darwin started his "B" notebook on ''Transmutation of Species'', and on page 36 wrote "I think" above his first [[tree of life (science)|evolutionary tree]].]]
[[文件:Darwin Tree 1837.png|缩略图|右|1837年7月中旬，达尔文开始了他《物种演变》一书中的“B”笔记，并在第36页的第一棵进化树上写下了“我认为”。]]