Here are a few notes about the biological role of carbon.
Carbon is key to life and by definition is present in all organic compounds.
The study of life is known as biological chemistry or biochemistry. The following gives the abundances of the elements in humans . Just enter your weight in either kilograms or pounds. In some browsers, after entering your weight you may have to click outside the text entry box to make the calculation work. Elements for which there are no data will always give a value of zero for the weight, no matter what you put in the weight box.