"The affinities of all the beings of the same class have sometimes been
represented by a great tree... As buds give rise by growth to fresh
buds, and these if vigorous, branch out and overtop on all sides many a
feebler branch, so by generation I believe it has been with the great
Tree of Life, which fills with its dead and broken branches the crust of
the earth, and covers the surface with its ever branching and beautiful
ramifications."
C. Darwin
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