Shells are the exoskeletons of clams, snails and oysters. Hope that helps
Answer:
ANOTHER ANTIBODY MOLECULE OR A
Explanation:
I just know
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.