Carbon and oxygen are two natural chemical elements, nonmetals.
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Nitrogen, iron, silicon, carbon, oxygen
carbon, hydrogen, and oxygen :)
Carbon, Hydrogen and Oxygen. http://www.sucrose.com/learn.html C6 H12 06
Wood is a hydrocarbon. When wood burns, the hydrogen and carbon in the wood combine with oxygen to produce water (H2O) and carbon dioxide (CO2). Depending on the other elements in the wood, other elements can be created. For example if there is sulfur in the wood, you could have sulfur dioxide (SO2).
There are more than four elements in proteins : Carbon, hydrogen, oxygen, nitrogen, sulphur and selenium being the main six. It is not clear where you got the number 4 from and therefore which four you are asking about.