Here's why:

* Nucleotides are the building blocks of DNA and RNA, the genetic material of all living organisms.

* Nitrogen is found in the nitrogenous bases, the "letters" of the genetic code (adenine, guanine, cytosine, and thymine/uracil).

* Phosphorus is found in the phosphate group, which links nucleotides together to form the DNA and RNA chains.

Let me know if you'd like to learn more about nucleotides or DNA/RNA!