Answer: Option (b) is the correct answer.
Explanation:
Nitrogen is important for all living things as it is an essential part of amino acids. Amino acids are the building blocks of proteins and nucleic acids, for example, DNA.
Whereas carbon is also present in all living beings or things and helps in completion of various chemical reactions within the human body.
Thus, we can conclude that nitrogen and carbon are important to life because they are needed for cellular growth.
