Estimates of Current Rates of Extinction

Estimates of current rates of extinction

A) indicate that we have reached a state of stable 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 greater than the mass extinctions at the close of the Cretaceous period.
D) indicate that only 1% of all of the species that have ever lived on Earth are still alive.
E) suggest that rates of extinction have decreased globally.