5. 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?

1. 1 only

2. 2 and 3 only

3. 1 and 3 only

4. 1, 2 and 3

Correct Answer :

1 only