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Home Q & A Board Biology-Related Homework Help General Biology
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alemvrocha alemvrocha
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5 years ago
Over the past 500 million years, there have been ________ mass extinctions, and each time, at least ________ of the species on Earth became extinct.
A) two; 25%
B) five; 25%
C) five; 50%
D) twelve; 96%
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Campbell Biology: Concepts and Connections

Campbell Biology: Concepts and Connections


Edition: 8th
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andrea s.andrea s.
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5 years ago
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alemvrocha Author
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5 years ago
This helped my grade so much Perfect
vanna2014
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Yesterday
Smart ... Thanks!
Gamiung3657
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2 hours ago
Thanks for your help!!
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