Answer:
Ozone
Explanation:
Ozone is considered a pollutant in the troposphere, but in the stratosphere it is essential to life on earth because it absorbs biologically harmful UV radiation. The mesosphere and the thermosphere are two additional atmospheric layers above the stratosphere.
I think it would be D. because your hypothesis wasn't correct.
The answer is A It protects the seed until it matures.
hope this helps
Index fossils are used for relative dating.