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Explosive evolution need not follow mass extinctions, study of ancient zooplankton finds

Following one of Earth's five greatest mass extinctions, tiny marine organisms called graptoloids did not begin to rapidly develop new physical traits until about 2 million years after competing species became extinct. This discovery, based on new research, challenges the widely held assumption that a period of explosive evolution quickly follows for survivors of mass extinctions.
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Fossil record of graptoloids challenges the theory that immediately after a mass extinction, species develop new physical traits at a rapid pace.


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