Answer:
The three essential nutrients needed by organisms are:
Carbohydrates: Carbohydrates are the primary source of energy for the body. They are found in foods like bread, pasta, rice, fruits, and vegetables.
Proteins: Proteins are essential for the growth and repair of tissues in the body. They are found in foods like meat, fish, eggs, dairy products, beans, and nuts.
Fats: Fats are important for energy storage, insulation, and protection of vital organs in the body. They are found in foods like oils, butter, cheese, nuts, and fatty fish.
It is important to note that these three nutrients alone are not enough for a healthy diet. Other important nutrients include vitamins, minerals, and water, which can be obtained from a balanced and varied diet.