Final answer:
UV rays have harmful effects such as skin cancer and heart disease.
Step-by-step explanation:
UV rays, also known as ultraviolet rays, can have harmful effects on the body. The primary harmful effects of UV rays are skin cancer, including melanoma and non-melanoma skin cancers, and heart disease. Prolonged and excessive exposure to UV radiation from the sun or tanning beds can damage the skin cells and increase the risk of developing these conditions.
Learn more about Harmful effects of UV rays