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A New, Sixth Global Mass-Extinction Event Appears to Be Occurring

Question 71

Multiple Choice

A new, sixth global mass-extinction event appears to be occurring on Earth today. The most likely explanation for the dramatic loss of species is


A) global warming.
B) natural fluctuations in global temperatures and precipitation.
C) the evolution of new types of viruses.
D) human activity that alters natural environments.
E) decreases in atmospheric levels of oxygen.

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