Living organisms depend on each other for survival and form a biotic community or biota.
Forests help to preserve the diverse life forms or living organisms around the world.
All animals depend on plants for food, directly or indirectly. For example, a rat eats grains and plants, a snake eats a rat, which is in turn eaten by an eagle.
It is like a chain that exists in nature. Such a chain is called a food chain.
Forests are rich in plants and animals. All plants and animals take in air to survive.
Green plants take in carbon dioxide of the air to manufacture their own food (photosynthesis) and release oxygen as a by-product.
Forests also serve as a sink for carbon dioxide given out by plants and animals during respiration; produced by burning coal and petroleum; given out as a result of volcanoes and other natural disasters.
Thus, forests help to maintain the levels of oxygen and carbon dioxide of the air.
Forests, especially rainforests, are referred to as the 'lungs' of the Earth.
