Consider the following statements: 1. The Earth's magnetic field has reversed every few hundred thousand years. 2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide. 3. When living organisms originated, they modified the early atmosphere of the Earth. Which of the statements given above is/are correct?
A1 only
B2 and 3 only
C1 and 3 only
D1, 2 and 3
Answer & Solution
Correct answer: C. 1 and 3 only
UPSC CSE Prelims 2018 (GS-I, Set C), Q.57. Official answer key: C.
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