The most important layer for all biological activity in the atmosphere is:

A. Troposphere.

B. Stratosphere

C. Mesosphere

D. Ionosphere

E. Exosphere

Answer: Option A

Solution(By Examveda Team)

Troposphere plays important role in moderating the temperature on earth that makes it habitable. This delicate exchange of energy between the earth's surface and atmosphere forbids the earth from becoming too hot and too cold.