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450,000,000 Years Ago

In this event, 60% to 70% of all species were extinct, where 85% were marine species.

The primary cause of the event is massive glaciation and sea-level drop. Overall, sea levels substantially dropped.

Species that were affected: Brachiopods, trilobites, graptolites, and moss animals.

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375,000,000 Years Ago

This mass extinction lasted for over 20 million years and at least 70% of all species went extinct The biggest evidence is attributed that the oxygen shortage was possibly triggered by global cooling or oceanic volcanism.

Species that were afected: Coral-sponge reefs in the tropics, fish, and plankton.

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252,000,000 Years Ago

96% of all marine species were extinct and 70% of terrestrial species. Probably the cause is severe volcanic activity, environmental change and long-term methane release.

Species that were affected: Marine invertebrates, land plants, plankton, insects, and all life.

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201,300,000 Years Ago

This event caused 70-75% of all terrestrial and marine species to extinction. Possible causes include volcanoes and giant flood basalts.

Species that were affected: Large amphibians, crurotarsans (not crocodiles), insects and conodonts.

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66,000,000 Years Ago

75% of the species became extinct, considering that all dinosaurs became extinct, except for avians, birds. The cause of this extinction event was an asteroid impact that left an impact called Chicxulub crater.

Species that were affected: Dinosaurs (not birds), pterosaurs, plesiosaurs, mosasaurs, and ammonoids.