The ozone layer protects living things on earth from a. visible light b. infrared rays c. ultraviolet radiation d. carbon dioxide

Option C - Ultraviolet radiation.

Explanation

The ozone layer protects living things on earth from Ultraviolet radiation. The ozone layer serves for the shorter wavelength and extremely dangerous ultraviolet radiation (UVR) from the sun, preserving life on Earth from its likely adverse impacts. When the sky is fair, there is an opposite connection between stratospheric ozone and cosmic UVR estimated at the Earth's surface.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.