Respuesta :

brittanycandace
UV rays can be found In the sun and in tanning beds.
UV rays can cause cancer (skin) if proper skin health is not happening (sunscreen)

I hope this helps you!
AnimeBrainly
UV rays (sunlight) are used in plants during photosynthesis, and helps generate oxygen for us using carbon dioxide that we produce

Humans: 
intake: oxygen
'waste': carbon dioxide

Plants:
intake: carbon dioxide
'waste": oxygen