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In earth's history there has(have) been ____ major extinction event(s) leading to the loss of 50% or more of the species present, not counting the current mass extinction.
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In earth's history there has(have) been ____ major extinction event(s) leading to the loss of 50% or more of the species present, not counting the current mass extinction.

User Jbfink
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There have been 5 Mass Extinctions throughout Earth's history.
User Steve Rossiter
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