Answer
8.a. The integumentary system (skin and associated structures).
Work Step by Step
The exposed integumentary system is almost constantly exposed to light, and is the most damaged by UVA and UVB rays in the the process of photoaging.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.