Final answer:
Carbohydrates (CHO's) provide energy to the body. Glucose is the most common fuel for ATP production in cells.
Step-by-step explanation:
The primary function of carbohydrates (CHO's) is to provide energy to the body. Carbohydrates can be in the form of complex carbohydrates (polysaccharides) like starch and glycogen, or simple sugars (monosaccharides) like glucose and fructose. Glucose, in particular, is the most common fuel for ATP production in cells, which is essential for proper cellular function.