D. living things in the biosphere.
The atmosphere contains all the air that plants and animals both use to survive so if there was a change within it, it would affect all living creatures in the biosphere.
I think that it is the anther.
The answer is A. They have a hydrocarbon backbone that can be chemically altered.
MJ Schleiden, Theodor Schwann and Rudolf Virchow are credited for the events described in the development of the cell theory.
