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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Earth is the only planet known to have life.

Reason (R): Earth has an atmosphere which is a mixture of Oxygen, Nitrogen and Carbon dioxide.

In the light of the above statements, choose the most appropriate answer from the options given below:

Solution

Correct Option: 2

Earth is indeed the only known planet with life (A is correct). Earth's atmosphere contains nitrogen, oxygen and trace CO2 (R is correct). However, life depends on multiple factors (water, temperature, distance from Sun), not just gas composition, so R is not the full explanation of A.

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