There are 25 elements found in living things. How many of these elements are found in some organisma but not all?

Of these, 25 are found in living things. As you can see in the pie graph at the left, about 97 percent of your body's mass consists of just four major elements - oxygen, carbon, hydrogen, and nitrogen. The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur.