A) It serves as the source of oxygen by decomposing air
B) It maintains the nitrogen cycle of the earth
C) It maintains the temperature of the earth
D) It protects them from excessive ultraviolet rays of the sun
Correct Answer: D
Solution :Like a sponge, the ozone layer absorbs bits of radiation hitting Earth from the sun. Even though we need some of the sun's radiation to live, too much of it can damage living things. The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms' protective layers, like skin, damaging DNA molecules in plants and animals.
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