Question

which atmospheric gas helps protect living things from ultraviolet radiation? ozone argon methane water vapor

Explanation:

Ozone in the Earth's stratosphere absorbs most of the Sun's ultraviolet radiation, protecting living organisms on the surface. Argon is an inert gas with no such protective - UV - related function. Methane is a greenhouse gas and water vapor is part of the water cycle and weather processes, neither of which protect from UV radiation.

Answer:

ozone