Q: 42 (IAS/2018)

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?

User login

For Search , Advanced Analysis, Customization , Test and for all other features Login/Sign In .