Buried deep in seabed sediments off east Africa,scientists possess uncovered a 24-million-year record of vegetation trends in the region where humans evolved. The authors say the record lends weight to the concept that we developed key traits—flexible diets, large brains, or complex social structures and the ability to walk and run on two legs—while adapting to the spread of open grasslands. The study appears today in a special human-evolution issue of the journal Proceedings of the National Academy of Sciences.
Source: phys.org