What is fermentation? what is photosynthesis? what are aerobic and anaerobic respiration?

An example of aerobic respiration is cellular respiration. Some examples of anaerobic respiration are alcohol fermentation and lactic acid fermentation. Photosynthesis is neither aerobic, nor anaerobic - it's in it's own special category. Aerobic and anaerobic respiration are both used to produce ATP.

answer; ///(b) it is composed of four protein chains and four heme groups;