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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]
Darwin's coral diagrams from his Notebook B. In biological context, the 'coral of life' as a metaphor is almost as old as the 'tree of life'. After returning from his voyage around the world, Darwin suggested in his notebooks that: The tree of life should perhaps be called the coral of life, base of branches dead; so that passages cannot be seen
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The idea of a tree of life arose from ancient notions of a ladder-like progression from lower into higher forms of life (such as in the Great Chain of Being).Early representations of "branching" phylogenetic trees include a "paleontological chart" showing the geological relationships among plants and animals in the book Elementary Geology, by Edward Hitchcock (first edition: 1840).
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Priceless notebooks belonging to Charles Darwin have been mysteriously returned to Cambridge University more than 20 years after they went missing.
Charles Darwin was probably right when he suggested all life on Earth started in a “primordial soup.” Scientists continue to find evidence of the theory.
Charles Darwin and the Tree of Life is a 2009 television documentary about Charles Darwin and his revolutionary theory of evolution through natural selection, produced by the BBC to mark the bicentenary of Darwin's birth. It is part of the BBC Darwin Season.