Here's why:

* The Periodic Table: The periodic table lists all the known chemical elements. Elements are the fundamental building blocks of matter.

* Amino Acids: Amino acids are organic molecules, meaning they contain carbon, hydrogen, and often oxygen, nitrogen, and sulfur. They are formed by the combination of multiple elements, not just one element from the periodic table.

Think of it this way: The periodic table lists the ingredients (elements), while amino acids are the specific recipes (molecules) made from those ingredients.