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If the integumentary system provides protection against the harmful rays of the sun, why should we also need to use sunscreen?

Answer 1

The skin can only last so long under UV rays of the sun.

Long-term exposure to direct sunlight can damage skin because UVA and UVB rays from the sun can cause damage to skin that is not immediately covered by the skin's protective layer.

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Answer 2

Austin Alexander

The integumentary system offers some protection, but sunscreen provides additional defense by absorbing or reflecting UV rays. It enhances the skin's ability to block harmful radiation, reducing the risk of sunburn and long-term damage.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.