During the period since the origin and diversification of life on earth, there have been episodes of mass extinction.
A
three
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B
four
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C
five
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D
six
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Solution
The correct option is C five During the long period since the origin and diversification of life on earth, there have been five episodes of mass extinction of species. But, the current species extinction rate is faster than the pre-human times and our activities are responsible for this.