(B) The sixth mass extinction is primarily driven by human activities.Its rate is estimated to be $100$ to $1000$ times faster than the natural backgr

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$(2)$ The present species extinction rates are $100$ to $1000$ times faster than in the pre-human times.

(B) The sixth mass extinction is primarily driven by human activities.Its rate is estimated to be $100$ to $1000$ times faster than the natural background rate observed in pre-human times.Therefore,option $(2)$ is the correct answer.

Class 12 Biology Biodiversity and Conservation Causes of Biodiversity Losses

Medium

Since the origin and diversification of life on Earth,there have been five episodes of mass extinction of species. How is the sixth extinction,which is in progress,different from the previous episodes?

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A
$(1)$ The current species extinction rates are far lower than those in previous episodes.
B
$(2)$ The present species extinction rates are $100$ to $1000$ times faster than in the pre-human times.
C
$(3)$ The present net species extinction rate is zero.
D
$(4)$ The current species extinction rate is nearly $10$ times faster than in previous episodes.