Substances found in foods that are needed for good health are called nutrient and is denoted as option A.
This is a substance which provides nourishment and ensures that the organism grows and survives. They are used by the body cells for their various metabolic activities.
Examples of nutrients which are present in various food substances include the following:
Carbohydrate is responsible for the provision of energy which is needed by the cells for their daily activities while protein helps to build and repair worn out tissues present in the body.
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