A Surprise for Evolution in Giant Tree of Life

Read more on this subject: Science
News Story Source: arclein
This controversial proposal stems from efforts by Hedges and collaborators to build the world's most comprehensive tree of life ?" a chart plotting the connections among 50,000 species of Earth's vast menagerie. Their analysis suggests that speciation is essentially random. No matter what the life form ?" plant or animal, insect or mammal ?" it takes about 2 million years for a new species to form. Random genetic events, not natural selection, play the main role in speciation.

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