Final answer:
Carbohydrates come primarily from plant sources because plants are able to produce carbohydrates through photosynthesis.
Step-by-step explanation:
Carbohydrates come primarily from plant sources. Plants are able to produce carbohydrates through photosynthesis, which is the process by which they convert sunlight, water, and carbon dioxide into glucose, the simplest form of carbohydrate. Examples of plant-based foods rich in carbohydrates include fruits, vegetables, grains, and legumes.
Learn more about Sources of carbohydrates