Which statement about the interaction of UV radiation and the skin is correct?

Pigmentation in the skin occurs in

UV radiation can cause redness in the skin. This occurs by:

How can customer's skin type be assessed?

The important pigmentation for "tanning" by means of UV radiation is:

The tanning of the skin is determined by:

For tanning of the skin, the following radiation is important:

Of the optical radiation, two types of radiation can reach the retina; these are:

The following can be stated about the thickness of skin layers:

One can divide the skin roughly into the following layers