Question

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.

Explanation:

The skin will protect for a while against the sun but, when the skin is exposed for long periods of time to direct sunlight it can cause damage. There are UVA and UVB ultraviolet rays from the sun that can cause harm.