BioScience Dictionary

 
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Found Mass extinction 1 time.

Displaying results 1 to 10.

1. Mass extinction
A time during which extinction rates are generally accelerated so that more than 50% of all species then living become extinct; results in a marked decrease in the diversity of organisms. Mass extinctions are thought to have occurred numerous times in Earth history, often from a variety of reasons: impacts, tectonism, changes in primary productivity of the seas, etc.