How Do Mass Extinctions Differ from Background Extinctions

question 2

Multiple Choice

How do mass extinctions differ from background extinctions?

• A)Mass extinctions account for most species that have gone extinct in the history of life on Earth.
• B)It is now recognized that mass extinctions but not background extinctions are generally caused by asteroid impacts.
• C)During mass extinctions a large proportion of organisms that were alive at that time die out.
• D)Background extinctions don't lead to great numbers of species lost.

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