Nutrients are the substances that are present in food show the correct answer is c.

Nutrients are substances that are essential for the growth, development, and maintenance of an organism. They provide energy, promote growth, repair tissues, and regulate various bodily functions. In the context of the given options, nutrients are primarily found in food.

Explanation:

Food as a Source of Nutrients:

- Food is the main source of nutrients for all living organisms, including humans. It provides the necessary substances required for the body's metabolic activities and overall well-being.
- Different types of foods contain different combinations and quantities of nutrients. For example, fruits and vegetables are rich in vitamins and minerals, while meats and legumes are good sources of proteins.
- Nutrients in food can be broadly classified into macronutrients and micronutrients. Macronutrients include carbohydrates, proteins, and fats, which are required in larger quantities to provide energy and support growth. Micronutrients include vitamins and minerals, which are needed in smaller amounts but are crucial for various physiological processes.

Importance of Nutrients:

- Nutrients play a vital role in maintaining the body's health and functioning. They are involved in processes such as digestion, absorption, metabolism, and elimination.
- Carbohydrates are the primary source of energy for the body. They are broken down into glucose, which fuels various bodily functions.
- Proteins are essential for the growth and repair of tissues. They are made up of amino acids, which are the building blocks of the body.
- Fats are an important source of energy and also help in the absorption of fat-soluble vitamins. They also provide insulation and protection to organs.
- Vitamins and minerals are necessary for the proper functioning of enzymes, hormones, and other molecules involved in metabolic processes. They are also involved in maintaining bone health, immune function, and overall well-being.

Conclusion:

In conclusion, nutrients are substances that are primarily found in food. They are essential for the growth, development, and maintenance of an organism. Nutrients provide energy, support growth, repair tissues, and regulate various bodily functions. While nutrients can also be found in other sources such as plants and water, the primary and most diverse source of nutrients is food.