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Question
Assertion (A): Oxygen plays a key role in the troposphere.
Reason (R): Troposphere is not responsible for all biological activities.
Options
Both (A) and R are correct and (R) is the correct explanation of (A)
Both (A) and (R) are correct and (R) is not the correct explanation of (A)
Both (A) and (R) are not correct
(A) is correct but (R) is not correct
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Solution
(A) is correct but (R) is not correct
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