The ability of nature to remain unchanged is called the balance of nature or ecological balance. The whole earth is an ecosystem, a system of give and take among plants, animals and their surroundings. In theory the ecosystem is a closed cycle but in practice the ecosystem is seldom in a state of balance. Gradual readjustment to the composition of a balanced community is continuously taking place. Man is often responsible for causing sudden ecological imbalance through activities like deforestation, polluting the atmosphere, destroying habitats, seas, lake and by rapid industrialization or sometimes through the out break of new disease.
