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The Earth As A Living Planet

2095 words - 8 pages

The Earth as a living planetYou can easily identify living things around you. Earth has life on its surface. Scientists are trying hard to find out whether life exists elsewhere also in the universe, but, till date they could not find any.The earth is a living planet where many complex systems run perfectly without stopping at all. When compared to other planets, it is evident that in all its aspects the earth is specially designed for human life. Built on some important balances, life prevails in every spot of this planet, from the atmosphere to the depths of the earth. However, even a minor change in any one of these arrangements would create very severe problems regarding the existence and survival of humankind.The Earth is a large habitat for living organisms. Many birds, animals, plants and micro-organisms live here. Some of them live in water, some in land and some in atmosphere.Exploring only a few of the millions of these balances would be sufficient to show that the world we live in is specially designed for us.One of the most important balances in our planet is revealed in the atmosphere that surrounds us. The atmosphere of the earth holds the most appropriate gasses in the most appropriate ratio needed for the survival not only of human beings, but also of all the living beings on the earth.For life to exist on a celestial body, some conditions are necessary. There must be the presence of some elements such as carbon (C), oxygen (O2), Nitrogen (N2) and hydrogen (H2) which are involved in the basic structures of complex molecules forming living cells. The 77% of nitrogen, 21% of oxygen and 1% of carbon dioxide as well as other gasses readily available in the atmosphere represent the ideal figures necessary for the survival of living beings. Oxygen, a gas that is vital for living beings, helps food to be burned and converted into energy in our bodies.If the oxygen percentage in the atmosphere were greater than 21%, the cells in our body would soon start to suffer great damages. The vegetation and hydrocarbon molecules needed for life would also be destroyed. If this percentage were any less, this would cause difficulties in our respiration, and the food we eat would not be converted into energy. Therefore, the 21% of oxygen in the atmosphere is the most ideal quantity determined for life.No less than oxygen, other gasses like nitrogen and carbon dioxide are also arranged in the ideal quantity for the needs of living beings and the continuity of life. The amount of nitrogen in the atmosphere has the ideal ratio to balance the harmful and burning effects of oxygen. This ratio represents the most appropriate value required for photosynthesis, which is essential for life's energy supply on the earth. Moreover, the amount of carbon dioxide has the most appropriate value that is needed to maintain the stability of the surface temperature of the earth and to prevent heat loss especially at night time. This gas, comprising 1% of the atmosphere,...

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