Final answer:
The root in the word nutrient signifies 'nourish'. Nutrients are essential substances needed by the body for various functions, including energy production, growth, and health maintenance. They include carbohydrates, proteins, lipids, water, vitamins, and minerals.
Step-by-step explanation:
The root in the word nutrient means to 'nourish'. Nutrients are substances the body needs to survive and function properly, including for energy, building materials, and control of body processes. There are six major classes of nutrients: carbohydrates, proteins, lipids, water, vitamins, and minerals. Essential nutrients such as certain vitamins and minerals are not synthesized by the body but must be obtained from food. For example, vitamins A and K are essential, fat-soluble vitamins required for important bodily functions such as maintaining connective tissue and blood clotting, respectively.