Today, Earth Is Said to Be Undergoing a Sixth Mass

Today, Earth is said to be undergoing a sixth mass extinction event, the first (and only) one caused by humans.This mass extinction event can best be distinguished from Earth's background extinction rate by considering the

A) type of animals going extinct.
B) location of most extinctions.
C) number of extinctions occurring per year.
D) fact that we now know the number of species present on Earth.
E) fact that it is caused by humans.

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