Estimates of Current Rates of Extinction

question 64

Multiple Choice

Estimates of current rates of extinction

• A) indicate that we have reached a state of stable equilibrium in which speciation rates equal extinction rates.
• 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.

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