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Assertion (A): The discovery of abrupt events in ice cores changed thinking about climate change.
Reason (R): It showed that the system can reorganise within decades rather than only gradually.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both are true and the reason gives the significance, and the possibility of such a transition in future is one reason abrupt change receives so much attention. Gradualism was the prior expectation. The events recur through the last glacial period.

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