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| Description: - Background extinction rate = extinction usually occurs one species at a time - Mass extinction events = five events in Earth’s history that killed off massive numbers of species at once - 50-95% of all species went extinct at one time - The best known extinction occurred 65 million years ago and brought to an end the age of the dinosaurs Picture Stats: Views: 237 Filesize: 233.06kB Height: 747 Width: 1305 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35651 |