Well, if a students wants to determine the effects of fertilizer on corn growth, they could set up a experiment.
There would be two groups of corn each exposed to the same conditions. The only difference is that one of the groups is given fertilizer. The other isn’t, meaning that it is the control group.
Their source of carbon. Autotrophs obtain their carbon from inorganic sources such as from atmospheric carbon dioxide. Examples of autotrophs include plants, and euglena ( a protist).
Heterotrophs on the other hand, obtain their carbon from organic sources such as other organisms. Examples of heterotrophs include all secondary consumers, and decomposers.
The answer is D its the right answer because on the moon there is not oxygen for it to reach that state