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Which of the following is true regarding extinction?

AExtinction that occurs in a relatively short period of time is referred to as background extinction.
BSingle events or several causes working together to produce extinction in a short period is referred to as mass extinction.
CIf the rate of speciation in a clade is equal to or less than the rate of extinction, the clade will survive.
DThe rate of extinction is steady from clade to clade as are the number of species contained within a clade.

Verified Answer :

WorldlyGlass49

I would say that B) single events or several causes working together to produce extinction in a short period is referred to as mass extinction, but I am not 100% sure.

mrsstravers112

I think it would be D. because in our text book it says and i quote

"The rate of speciation and extinction varies from clade to clade. Some clades contain many species that have survived for long periods of time. Other clades have only a few species, which soon become extinct."

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