Question

Why is nitrogen important?

A. It is essential to building proteins and nucleic acids.
B. It does not have to be converted into a fixed form to work.
C. Organisms utilize it directly.
D. It makes up 50% of Earth's atmosphere.

Answer 1

All of the options are important but the best reason is:

a) Nitrogen is an essential part of biological molecules such as proteins and nucleic acids (DNA).