Final answer:
UV light, including sunlight, can be considered a mutagen. UV-B, which reaches the Earth's surface, can interact with biomolecules like DNA and cause mutations. UV-B also causes certain types of skin cancers in humans.
Step-by-step explanation:
UV light, including sunlight, can be considered a mutagen. The three types of UV light are UV-A, UV-B, and UV-C. UV-B, which reaches the Earth's surface, can interact with biomolecules like DNA and cause mutations. Laboratory and epidemiological studies have shown that UV-B causes certain types of skin cancers in humans. Additionally, UV-B can cause cataracts, a clouding of the lens in the eye.