The correct answer for the given question above is the second option. Primitive heterotrophs produce energy through chemical fermentation. Chemical fermentation is the same with the process of anaerobic respiration. This involves the breaking down of glucose into energy sources anaerobically.
The correct statement is that viruses are not living, although this concept is widely debated. In truth, viruses are neither living nor non living, they have not been classified properly as of yet. Viruses do NOT have organelles and they can NOT produce their own energy thus they rely on other cells to provide energy and to reproduce and spread the virus for them to other cells. (I'm fascinated by viruses, sorry i rambled!)
Enzymes bind with chemical reactants called substrates. There may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. In some reactions, a single-reactant substrate is broken down into multiple products.
Answer:
ATP is produced most efficiently by structure C.(mitochondria)