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Charles Darwin's illness caused repeated delays. His paper on Glen Roy had proved embarrassingly wrong, and he may have wanted to be sure he was correct. David Quammen has suggested all these factors may have contributed, and notes Darwin's large output of books and busy family life during that time. [50]
Darwin's ideas developed rapidly after returning from the Voyage of the Beagle in 1836. By December 1838, he had developed the basic principles of his theory. At that time, ideas about the transmutation of species were associated with radical political ideas of the Age of Enlightenment and the French Revolution, and some people, such as Darwin's old instructor Robert Edmond Grant had been ...
Darwin knew that nature had to produce variations before natural selection could act …The problem had been caught by other evolutionists almost as soon as The Origin of Species was first published. Sir Charles Lyell saw it clearly in 1860 before he even became an evolutionist…(Reid, p.3) [ 10 ]
Divergent evolution or divergent selection is the accumulation of differences between closely related populations within a species, sometimes leading to speciation. Divergent evolution is typically exhibited when two populations become separated by a geographic barrier (such as in allopatric or peripatric speciation ) and experience different ...
The tree of life or universal tree of life is a metaphor, conceptual model, and research tool used to explore the evolution of life and describe the relationships between organisms, both living and extinct, as described in a famous passage in Charles Darwin's On the Origin of Species (1859). [1]
Divergent is the debut novel of American novelist Veronica Roth, published by HarperCollins Children's Books in 2011. The first in the Divergent series, a trilogy of young adult dystopian novels (plus a book of short stories), [1] the novel is set in a post-apocalyptic Chicago, where society defines its citizens by their social and personality-related affiliation with one of five factions.
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[1] [2] [3] Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book On the Origin of Species. [4] He also identified sexual selection as a likely mechanism, but found it problematic.