A) Excretion
B) Digestion
C) Circulation
D) Respiration
Correct Answer: D
Solution :
Digestion is the breakdown of complex organic food molecules (carbohydrates, lipid, fats proteins and nucleic acids) into simpler organic molecules by hydrolysis. In digestion, polysaccharides are breakdown into monosaccharides like glucose. Excretion is the removal of nitrogenous wastes from the body. It is normally associated with the process of maintenance of osmotic concentration. Circulation is the mass flow of fluid (.eg, blood or lymph) through the tissues and organs of an animal, allowing the transport and exchange of materials as oxygen, nutrients and waste products.
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