Answer:
The part of the paragraph "The recent activities of fossil fuel combustion has had an adverse effect on the ozone layer" indicates that the ozone layer depleting.
Explanation:
The ozone layer creates protective covering to earth and protects the surface of the Earth from harmful UV rays coming from the sun. But the fossil fuels and greenhouse gases that human burn are depleting this protective shield.
Thus, the part of the paragraph "The recent activities of fossil fuel combustion has had an adverse effect on the ozone layer" indicates that the ozone layer depleting.
