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there was an evolution in the few mammal species that existed and the dinosaurs had a mass extinction! ( ̄(▽▽) ̄)

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Answer:

Two major event of Mesozoic Era

1. Existence and Birth of Dinasours.

2. The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction which is known for having killed off non-avian dinosaurs, as well as other plant and animal species.

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