'Terrestrial agents' presentation slideshows

The five largest mass extinctions in Earth's history occurred during:

The five largest mass extinctions in Earth's history occurred during: 1.The late Ordovician period (about 438 million years ago) - 100 families extinct - more than half of the bryozoan and brachiopod species extinct. 2.The late Devonian (about 360 mya) - 30% of animal families extinct.

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