Sentences with phrase «modern groups evolved»

Early modern groups evolved in parallel with each other and exchanged members to give rise to modern population groups.

The new study controverts the early origin model, concluding that the placentals originated after the mass extinction event, with the first modern groups evolving two million to three million years later — after the breakup of the supercontinent Gondwana.

Not exact matches

«Thus, both palaeo - anthropological and genetic evidence increasingly points to multiregional origins of anatomically modern humans in Africa, i.e. Homo sapiens did not originate in one place in Africa, but might have evolved from older forms in several places on the continent with gene flow between groups from different places,» says Carina Schlebusch.

What happened was this: Modern humans evolved from hunter - gatherer groups that were rather isolated from each other to increasingly cooperative groups that formed social networks across the landscape.

«It's been proposed that Neanderthals depended on visual - spatial abilities and toolmaking, for survival, more so than on the social affiliation and group activities that typify the success of modern humans — and that Neanderthal brains evolved to preferentially support these visuospatial functions,» Berman explained.

The team discovered that the genes responsible for the regulation of NRL became more refined in the placental mammals as the modern retina evolved and were lost in several non-mammalian groups.

Over the course of hominin (modern humans and their fossil ancestors) evolution, molars have changed markedly in their configuration, with some groups developing larger cusps and others evolving molars with a battery of smaller extra cusps.

For decades, one theory dominated the world of paleontology: Modern birds evolved from a wide - ranging group of dinosaurs called theropods, of which the Tyrannosaurus rex was one.

«Our textbook - changing discovery will require paleontologists to re-evaluate the timing of the origin of modern amphibian groups and how they evolved,» Huttenlocker noted.