It is a that is what I think
Monosaccharides / Polysaccharides
The correct answer would be D) decomposers. Decomposers do just what they're named for. Decompose things. They break down dead plant and animal material, gaining nutrients from it, while releasing CO2 into the atmosphere.
Biosphere 2 was a tremendous success, Many people don't realize that hundreds of papers were written about it.
