Can someone help I’ve been stuck at this question for the past 10 minutes A extinction occurs when many species go extinct in a relatively short period of time

I think it's

A mass extinction occurs when many species go extinct in a relatively short period of time.

Explanation:

Mass extinction is usually defined as a loss of about three-quarters of all species in existence across the entire Earth over a “short” geological period of time. Hence, I think the answer is correct.

The correct answer is Mass