| A | B |
|---|
| Oxygen | Necessary for celluar respirtation |
| Carbon | Backbone of organic molecules |
| Hydrogen | Necessary for energy transfer and respiration |
| Nitrogen | Component of protein and nucleic acids |
| Calcium | Component of bones and teeth |
| Phosphorus | Principle component in back bone of nucleic acids |
| Potassium | Principle positive ion found within cells |
| Sulfur | Component of most proteins |
| Sodium | Important positive ion surrounding cells, very important for nerve function |
| Chlorine | Important negative ion surrounding cells |
| Magnesium | Component of many energy-transferring enzymes |
