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THE GENIUS OF CHARLES DARWIN -- ILLUSTRATED SCREENPLAY & SCREENCAP GALLERY |
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They had changed over time. They must have evolved.
Now he wanted to pull together all the evidence
to understand how and why this had happened.
It took Darwin 20 years of research on and off
to develop the ideas that would eventually be set out
in "The Origin of Species."
He wanted to be fully certain of his facts.
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