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First Mass Extinction

New fossil evidence supports theory that first mass extinction engineered by early animals

Newly discovered fossil evidence from Namibia strengthens the proposition that the world's first mass extinction was caused by 'ecosystem engineers' -- newly evolved biological organisms that altered the environment so radically it drove older species to extinction. Ref. Source 7i.

First Mass Extinction

I feel first mass extinction should be expanded quickly maybe that conceive what are the ins and outs of it.