Species count put at 8.7 million

The natural world contains about 8.7 million species, according to a new estimate described by scientists as the most accurate ever. But the vast majority have not been identified - and cataloguing them all could take more than 1,000 years. The number comes from studying relationships between the branches and leaves of the "family tree of life".

2011-08-23

 family tree life evolution species taxonomy extinction

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