Explanation:

- Nitrogen is an essential part of chlorophyll, which is the pigment responsible for the green color in plants and critical for photosynthesis.

- Nitrogen is a key component of RNA, which is needed for protein synthesis and various cellular functions.

- Nitrogen is a fundamental part of DNA, which carries genetic information in living organisms.

- Option 4: Carbohydrate – Correct Answer. Carbohydrates do not contain nitrogen as a fundamental element. They are composed of carbon, hydrogen, and oxygen.