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A general research study by Stanford, Princeton and UC Berkeley reveals that the world is on the brink of the 6th mass extinction of biological species....

This led to mass extinctions on Earth. Nearly all animals, including many creatures belonging to Crocodylomorpha, early amphibians and mammals died off.
However, the early dinosaurs from that period survived....

As support for his hypothesis he points to the 5 mass extinctions on Earth from the dawn of its existence, most of which he believes were caused by complex multicellular organisms....

But even if it turns out to be true, it does not necessarily exclude the widely accepted theory of the mass extinction of the majority of biological species on Earth - the collision with a meteor and the consequential changes...

They also hypothesize that Abelisaur survived for several years after the mass extinction of its contemporaries....

It also turns out that the dinosaurs appeared several million years after a mass extinction caused by a volcano eruption. This led to warming and a change in the climate....

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