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 used for various important purposes: Water in Agriculture. Water plays the most important role in agriculture. Agriculture is impossible without irrigation throughout the crop season. Irrigation ensures proper plant growth.
The Importance of Clean Water. sidebarA. Fresh water is one of our most vital resources, and when our water is polluted it is not only devastating to the environment, but also to human health. The US relies on public water systems to treat and deliver just over 44 billion gallons of clean water each day to our homes, schools and businesses.