Here's why:

* Organic chemistry is the study of carbon-containing compounds.

* Organic molecules are molecules that contain carbon, along with other elements like hydrogen, oxygen, nitrogen, and sometimes others.

* Carbon's unique ability to form four covalent bonds with other atoms allows it to create long chains, rings, and complex structures.

While there are exceptions like carbon dioxide (CO2), which is inorganic, the vast majority of organic molecules contain carbon as a central element.