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Human ancestors' diet switched to grass 3.5 million years ago
 
Human ancestors' diet switched to grass 3.5 million years ago
A set of new studies from the University of Utah and elsewhere found that human ancestors started eating an increasingly grassy diet 3.5 million years ago. The studies included analysis of tooth enamel from fossils of several early African humans, their ancestors and extinct relatives, some of which are shown here. (Press photo credit: National Museums of Kenya. Photos by Mike Hettwer, except Homo sapiens by Yang Deming.)
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