Question

what allowed life to survive on land for the first time?
formation of continents
increase in volcanoes
extinction of marine life
the ozone layer blocking uv radiation

Explanation:

The ozone layer blocks harmful UV radiation. UV radiation can damage living organisms. By blocking UV radiation, the ozone layer allows life to survive on land. Other options like formation of continents, increase in volcanoes, and extinction of marine life are not directly related to allowing life to survive on land for the first time.

Answer:

The ozone layer blocking UV radiation.