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18.1 The biodiversity crisis  (Page 13/27)

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13 / 27  A mass extinction is defined as ________.
A  a loss of 95 percent of species
B  an asteroid impact
C  a boundary between geological periods
D  a loss of 50 percent of species
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Practice MCQ 4 FlashCards 2 Key Terms 12

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Source:  OpenStax, University of georgia biology. OpenStax CNX. Dec 09, 2013 Download for free at https://legacy.cnx.org/content/col11585/1.6
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