Question

The four elements that make up $99\%$ of all elements found in a living system are

• A. C,H,O and P
• B. C,H,O and S
• C. C,H,O and N
• D. C,N,O and P

Answer 1

The correct option is C C,H,O and N

The four most important elements found in living systems are carbon, hydrogen, oxygen and nitrogen. They make up 99% of all elements present in the cell. Molecules like proteins, carbohydrates, lipids and nucleic acids are made up of these four elements. Other elements like sodium, potassium, calcium, phosphorus etc also play a crucial role in the living system.

Thus, the correct answer is 'C,H,O and N.'