Question

what does uvb primarily affect in humans? superficial skin layers internal organs bones and joints

Explanation:

UVB (Ultraviolet B) rays have shorter wavelengths compared to UVA rays. They are absorbed more by the outer layers of the skin. UVB is the main cause of sunburn and plays a significant role in skin aging and skin cancer development. It does not penetrate deeply enough to primarily affect internal organs or bones and joints.

Answer:

superficial skin layers