21Cretaceous period
During the Cretaceous period (145 - 100 million years ago), Earth's climate was so warm that there were no polar ice caps, and forests probably extended all the way to the South Pole. Local plants and dinosaurs evolved to live in continuous sunlight in the summer and darkness in the winter.
22Australopithecus
Australopithecus, anatomically similar to modern humans, co-existed with Megalodon, the biggest shark species that ever lived.
23Homo erectus
Ancient human ancestor Homo erectus ate cooked food as long ago as 1.9 million years.
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