Water is a necessity for life as all living things need water to survive. A human being can last more than 30 days without food but 3 days without water would result in dehydration and subsequently death. Where there is water, such as in rivers or lakes, there is life. We can see wherever the great rivers of the world flow, there is an abundance of trees, fishes in the waters and various fauna coming to drink.
In places, like Africa, where water is scarce during the dry seasons, animals must adapt to their harsh living environments.