How are the troposphere, stratosphere, and thermosphere important for supporting life on earth? which layer of the atmosphere is likely the most important for life on earth?

If you go onto sciencetuuipp.org it will give you the answer to all of these.

Sunlight passes through the atmosphere, warms Earth's surface. The warmth is radiated to the troposphere causing weather. The area of the stratosphere that contains the highest concentration of ozone gas. The troposphere is the most important layer

The answer is frictional force