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.
The krebs cycle
I know this from a multiple choice question I helped my friend with lol
Alarge vacuoles cell walls and chloroplasts
