Evolution is a random phenomenon driven by natural selection.
New characters appear with mutations, these characters impose themselves when they confer an advantage, and it happens that environmental changes accelerate this phenomenon.
Two new studies published in the journal
Science
provide new information on a crucial period of the ancestors of the human line.
21 million years ago, climate change made Africa more arid, favoring the appearance of savannahs and grasslands and thus fragmenting the great tropical forests.
A transformation of landscapes that occurred more than 10 million years earlier than scientists thought, and which coincides with the appearance of new forms of locomotion in certain primates.
To discover
These 24 hours that killed the dinosaurs: the incredible tale of a cataclysm
“
Climate models published in
2006 had already evoked this aridification of Africa, comments
Sébastien Nomade, geochemist and paleoclimatologist at the Laboratoire des sciences du climat et de…
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