Biology, 19.10.2019 22:30 zubeenakhtar1386

Mass extinctions occurred 250 million years ago and 65 million years ago. according to some scientists, which of the following reasons caused both mass extinctions? the earth’s oceans changed a few degrees in temperature. the diversity in the gene pool decreased dramatically. a new species was introduced into an established ecosystem. a large comet or asteroid hit the earth.

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