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Extinction: 440 million years ago
animals included trilobite family trinucleotide and trilobite family bathyergid, Brachiopod genus Thaerodontav, Brachiopod genus Thaerodonta.

90% of all species died out during the Ordovician period that lasted 45 million years

Most animals went extinct because of a ice age that occurred in the southern hemisphere which caused all of the world to cool down. The fauna emerged during the end of the Ordovician period and was dominated by the  predators.

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365 million years ago
animals included trilobite family trinucleotide and trilobite family bathyergid, brachiopod genus thaerodontav, brachiopod genus thaerodonta, and the jawless fish. 70% to 80% of all species died out during the Devonian period that lasted 45 million years. Species went extinct because of the rapid cool downs or rapid heating up of the earth. Oxygen levels lowered in some environments due to the rapid heating up in the environments.

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250 million years ago
animals included marine reptiles, branchiopods, and the gastropods. 90% of all species died out during the permian-triassic extinction that lasted 15 million years. The permian-triassic extinction happened because of acid rain and volcanic ash from volcanic eruptions. The animals that survived were the therapsids and the archosaurs. When the extinction ended the therapsids dominated as the predators.

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210 million years ago
animals included crocodylomorph, Jurassic fish, Jurassic Amphibians. 76% of all species died out during the Triassic-Jurassic extinction that lasted 7 million years. Species went extinct because of volcanic eruptions all around the world that increased the C02 levels that effected the ocean and the animals that lived on land and in the waters.

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65 Million Years Ago
animals included Tyrannus, Achelousaurus, Aegyptosaurus 80% of all species died out during the cretaceous-tertiary extinction that lasted 79 million years. Species went extinct because of a massive asteroid that hit the planet and that devastated the species and the environments that they lived in the cretaceous-tertiary extinction lasted for 79 million years