Answer:
Biosphere and atmosphere.
Step-by-step explanation:
Biosphere refers to the living organisms lives on the earth surface. All plants takes carbon in the form of carbondioxide gas from the atmosphere for the production of glucose in the process of photosynthesis and releases carbondioxide by the living organism in the process of respiration as a waste product. We can conclude from this discussion that photosynthesis acts to transfer carbon between two Earth systems such as biosphere and atmosphere.