In general, foods are made up of carbohydrates, proteins, and fats, each of which provide a different number of calories: 1  Carbohydrates provide 4 calories per gram. 2  Proteins provide 4 calories per gram. 3  Fats provide 9 calories per gram.
IMPORTANCE OF WATER. Water is our lifeline that bathes us and feeds us. In ancient cultures water represented the very essence of life. The Romans were the first to pipe water into their growing cities, especially with their aqueducts.
Importance of safe drinking water. 4.1 A safe, clean, and reliable supply of drinking water is critical to public health. In many parts of the world, drinking water is still untreated and carries water-borne diseases causing human illnesses and death.