Carbon, hydrogen, and oxygen are not made from anything else. They are elements, the most basic building blocks of matter.

Here's a breakdown:

* Carbon (C): An element with atomic number 6. It has 6 protons, 6 neutrons, and 6 electrons.

* Hydrogen (H): An element with atomic number 1. It has 1 proton, 0 neutrons, and 1 electron.

* Oxygen (O): An element with atomic number 8. It has 8 protons, 8 neutrons, and 8 electrons.

These elements cannot be broken down further into simpler substances. They are the fundamental building blocks of countless other molecules, such as water (H₂O), carbon dioxide (CO₂), and carbohydrates.