Nitrogen and carbon are important to life because
they're needed to breathe
they are needed for cellular growth
they produce water
they have strong bonds

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.

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.