Final answer:
The main function of carbohydrates is to provide quick energy to living organisms.
Step-by-step explanation:
The main function of carbohydrates is to be a source of quick energy for living things. They are composed of simple sugars like glucose, and complex forms such as starch and glycogen, which are long chains of monosaccharides. When consumed, carbohydrates are broken down into glucose, which is absorbed and used to produce ATP (adenosine triphosphate), the energy currency of the cell. Although carbohydrates can also function as energy storage, this role is more commonly associated with fats in the context of long-term energy storage.