In Earth's history,there has/have been ____ major extinction event(s)leading to the loss of 50% or more of the species present.

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There have been five major extinction events throughout Earth's history, known as the Big Five. These events include the Ordovician-Silurian extinction, the Late Devonian extinction, the Permian-Triassic extinction, the Triassic-Jurassic extinction, and the Cretaceous-Paleogene extinction. These events saw the loss of 50% or more of the species present at the time, and each had unique causes and consequences.

In Earth's History,there Has/have Been ____ Major Extinction Event(s)leading to the Loss