Which of the following is the importance of the layer marked 'X' in the figure given below?

It protects the Earth from asteroids.

The layer 'X' provides living things with oxygen.

Which of the following is the importance of the layer marked 'X' in th

1.	Which of the following is the importance of the layer marked 'X' in the figure given below?
A.	The layer 'X' provides living things with oxygen.
B.	It protects the Earth from asteroids.
C.	It gives out heat.
D.	It is useful only to plants.
Answer» B. It protects the Earth from asteroids.