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This extinction is also known as the K-T extinction for short and occurred around 65 million years ago. Dinosaurs, pterosaurs, plesiosaurs, mosasaurs and ammonoids were killed off from extreme asteroid or meteor impact.

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210 million years ago, this extinction happened due to major volcanic activity causing basalt flooding, global climate change, and changing pH and sea levels. Large amphibians, crurotarsans (not crocodiles), insects and conodonts were all affected and killed.

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This was the largest extinction event in history, killing about 95% of all living species. Asteroid strikes, volcanic activity, climate change, and microbes were most likely the cause of this, but it's mostly unknown. It killed off marine invertebrates, land plants, plankton, insects and all life.

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The Devonian extinction happened around 365 million years ago because of lack of oxygen in oceans, fast cooling of air temperatures, volcanic eruptions, and meteors. 80% of all species were killed including coral-sponge reefs in tropics, fish and plankton.

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An extinction event (mass extinction) is when at least half of all species die out in a fairly short amount of time

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This extinction occurred about 440 million years ago. The cause is continental drift and subsequent climate change. Although, going into the full story, this might have happened in two waves to cause such a great extinction of 85% of all living species. Brachiopods, trilobites, graptolites and moss animals were the main species killed.