Answer the following question given this paragraph: 

Ozone (O 3 ) depletion in the atmosphere is of significant concern. This gas serves as a protection against the ultraviolet rays of the sun. Ozone is naturally depleted in addition to the depletion caused by human-made chemicals. The depletion reaction is a two-step process:.


Q: What done ozone help protect against?

 Choices:

- gamma rays

- x-rays

- helium rays

- ultraviolet rays

A:
ultraviolet rays
