An ecosystem is all the populations of organisms that live together and

A. the microorganisms that depend on them.

B. the organisms that generate energy from sunlight.

C. the physical factors with which they interact.

D. the food that they take in as energy.

Plants use light energy to make sugars from carbon dioxide ... They make their own food thru the processof photosynthesis using light energy to ... In photosynthesis carbon dioxide from the air and water from the soil react with the sun's energy to ... tiny subcellular structures contained in the cells of leaves andgreen stems.