Consider the following statements – 1. The Earth's magnetic field is reversed every few hundred thousand years. When the Earth formed more than 4000 million years ago, oxygen was 54% and carbon dioxide was not.3. When living organisms were born, they changed the early atmosphere of the earth. Which of the above statements is/are correct?

Consider the following statements – 1. The Earth's magnetic field is

1.	Consider the following statements – 1. The Earth's magnetic field is reversed every few hundred thousand years. When the Earth formed more than 4000 million years ago, oxygen was 54% and carbon dioxide was not.3. When living organisms were born, they changed the early atmosphere of the earth. Which of the above statements is/are correct?
A.	केवल 1
B.	केवल 2 और 3
C.	केवल 1 और 3
D.	1, 2 और 3
Answer» D. 1, 2 और 3