The correct answer is Atoms. All matter, which includes everything around us, is made up of atoms. Atoms are the smallest units of matter, and they form the basic building blocks of everything in the universe.

An atom consists of three subatomic particles: protons, neutrons, and electrons. These particles are arranged in a way that forms the structure of an atom. Protons and neutrons are located in the nucleus (center) of the atom, while electrons move around the nucleus in orbits.

When atoms combine in different ways, they form molecules, which make up the different substances we see in the world. For example, a molecule of water is made of two hydrogen atoms and one oxygen atom.

So, whether its a solid, liquid, or gas, all matter is made up of atoms. Atoms are invisible to the naked eye, but they are the basic units that make up everything we encounter in our daily lives, from the air we breathe to the objects we touch.