Sri Lanka Job Vacancies - National Aquatic Research Research Agency
............................................................................................................................ The bodies of all organisms are composed of variety of chemical compounds. These chemical compounds are formed by the bonding of naturally existing elements in different ways. There are only about 25 elements in the living body out of the 92 elements present in nature. They are present at different locations in the body in different forms. The most common 4 elements in the living body are Carbon, Hydrogen, Oxygen and Nitrogen. Other than above Sulphur, Phosphorous, Sodium, Potassium, Calcium, Magnesium, Iron and Chlorine are essential for the survival of organisms. The below figure 1.1 shows the percentages of main elements in the human body. Tl ai sck a ldnk a yhsv%ck a khsg %ck a fjk;a 3] 65] 18] 10] 4] Oxygen Carbon Hydrogen Nitrogen Others Figure 1.1- Percentages of 4 common elements in ...
