The troposphere contains 90% of the ozone in the atmosphere. select the best answer from the choices provided
a. true
b. false

It is a true fact that the troposphere contains 90 percent of the ozone in the atmosphere. The correct option among all the options that are given in the question is the first option or option "a". The troposphere is actually the lowest layer of the atmosphere of earth. I hope the answer helps you.

The answer would be (c), mass extinctions

Ihave no idea what the answer is