1.

Estimates of current rates of extinction..

A. indicate that we have reached a state of unstable equilibrium in which speciation and extinction rates are approximately equal.
B. suggest that one-half of all animal and plant species may be gone by the year 2100.
C. indicate that rates may be 1,000 times higher than at any other time in the last 100,000 years.
D. B and C only are true.
Answer» E.


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