Mass extinctions led to low species variety, dinosaur rule

Two of Earth’s 5 mass extinction occasions — occasions when greater than half of the world’s species died — resulted within the survival of a low variety of so-referred to as ‘weedy’ species that unfold their sameness the world over because the Earth recovered from these dramatic upheavals. The findings might make clear trendy excessive extinction charges and the way organic communities might change sooner or later.
Paleontology News — ScienceDaily

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