15. What is the role of the
ozone layer for living beings?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Ozone, O3, is a of the atmosphere
that ultraviolet radiation from the
disallowing most of that
from reaching the surface the planet.
Ultraviolet radiation harmful for living
beings it is a mutagen can
cause cancer (mainly cancer), other
DNA mutations even burns.