Matter is made of atoms, not molecules.

Here's why:

* Atoms: The fundamental building blocks of all matter. They are the smallest unit of an element that retains the chemical properties of that element.

* Molecules: Formed when two or more atoms bond together chemically.

So, while molecules are made up of atoms, they are not the fundamental building blocks of matter themselves.

Think of it this way:

* Atoms are like LEGO bricks. You can build all sorts of structures (molecules) with them, but the bricks themselves are the basic units.

* Molecules are like LEGO structures. They are built from LEGO bricks (atoms), but they are not the bricks themselves.

Examples:

* Water (H2O): A molecule made of two hydrogen atoms and one oxygen atom.

* Oxygen (O2): A molecule made of two oxygen atoms.

* Iron (Fe): An element that exists as individual atoms.

Let me know if you have any more questions!