Which pattern best characterizes the history of extinctions on Earth?

A. An increasing per capita background extinction rate
B. Five major mass extinctions and several lesser episodes of heightened extinction rates
C. Three major mass extinctions and several lesser episodes of heightened extinction rates
D. Three major mass extinctions and a low background extinction rate
E. An increase in the number of mass extinctions over time


Ans: B. Five major mass extinctions and several lesser episodes of heightened extinction rates

Biology & Microbiology

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