FRESHWATER ECOSYSTEMS

Water is the most vital element among the natural resources, and is crucial for our very existence. Without water, life as we know it could not exist. All living organisms including man, all the life supporting process of the earth system is heavily dependent on water. Living cells themselves consist mainly of water. The human body is two-thirds water- an essential nutrient in every function. It helps transport other nutrients and waste products in and out of cells. Water dissolves the carbon dioxide, oxygen and salts present in the body and distribute to the different parts through the process of blood circulation. It is greatly needed for the maintenance of proper body temperature.