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Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
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12 years ago
Estimates of current rates of extinction 

A) suggest that rates of extinction have decreased globally.
B) suggest that one-half of all animal and plant species may be gone by the year 2100.
C) indicate that we have reached a state of stable equilibrium in which speciation rates equal extinction rates.
D) indicate that only 1% of all of the species that have ever lived on Earth are still alive.
E) indicate that rates may be greater than the mass extinctions at the close of the Cretaceous period.
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12 years ago
My vote is with E.

A and C are wrong, B seems overblown by a long shot, and D is true overall only 1% of species or less might be around but that isn't tied to extinction rates currently.
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