Final answer:
UVA and UVB rays can impact human skin negatively by causing skin ageing, DNA damage, and skin cancer, while also inducing vitamin D production.
Explanation:
UVA and UVB are types of ultraviolet (UV) light that can impact human skin. UVA penetrates deeply, contributing to skin ageing, DNA damage, and possibly skin cancer, while UVB damages skin cells, leading to conditions such as sunburn, cataracts, and skin cancer. UV exposure can also have beneficial effects, such as inducing vitamin D production in the skin.
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