Some infants cannot synthesize several of the traditionally nonessential amino acids. These amino acids must be obtained from the diet until the baby matures and are referred to as

conditionally essential amino acids

Explanation:conditionally essential amino acids can not be made by the body,you can get them from diet. It is use under pathophysiological condition such as premature in infant or individual in severe catabolic distress.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."