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Importance of Carbon:, , The amount of carbon present in the earth's crust, and in the atmosphere is quite less., , The earth's crust has only 0.02% carbon in the form, of minerals (like carbonates, hydrogen, carbonates, coal and petroleum) and the, atmosphere has 0.03, of carbon dioxide., , In spite of this small amount of carbon available in, , nature, the importance of carbon scems to be, immense., , Carbon acts as a macronutrient for the body in, carbohydrates form. This is substantiated by the, fact that each body part requires and contains, large amounts of carbon.

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Importance of Carbon:, , Carbon constitutes roughly 18 percent of body mass, and millions of carbon atoms form the thousands of, molecules in virtually every cell., , Compounds such as proteins, DNA, and fat all contain, carbon., , Cellular respiration is a process through which the, body releases energy stored in glucose, whichis a, compound composed of carbon, hydrogen and, oxygen.

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Nitrogen