Here's why:

* Amino group: An amino group is a functional group with the formula -NH2. It consists of a nitrogen atom bonded to two hydrogen atoms.

* Acids: Acids typically contain a carboxyl group (-COOH), which is acidic.

* Amino acids: Amino acids are organic molecules that contain both an amino group (-NH2) and a carboxyl group (-COOH). They are the building blocks of proteins.

Therefore, the element nitrogen is the fundamental component of the amino group, which is a key feature of amino acids.