Which ingredient(s) in NA/NaCl are used: a to solidify the medium b as source of energy c as source of carbon d as source of nitrogen

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Modes of Nutrition

It is a biological process of providing or obtaining food that is necessary for growth and health. It includes many physiological processes - absorption, ingestion, assimilation, catabolism, excretion, etc. In biology, the science that deals with nutrition's physiological and chemical processes are called "nutritional science."