Which of the following is a possible consequence of ozone layer depletion on living organisms? a. increased exposure to ground-level ozone b. decreased levels of ultraviolet radiation in the troposphere c. increased levels of ultraviolet radiation absorption in the stratosphere d. none of the above

The ozone layer of the third is very important as it functions to reflect back some of the ultraviolet rays from the sun back to the outer space. Its depletion can caused increased exposure to ground-level ozone. When ozone is in the stratosphere, it is harmless; however, when it is in ground-level, it is poisonous. Thus, the answer is letter A.