What all did theyplains Indians use the corn beans squash and sunflowers?

Plains Indians utilized corn, beans, squash, and sunflowers as staple foods in their diets, forming the basis of the "Three Sisters" agricultural system. Corn provided a carbohydrate source, beans added protein and improved soil fertility, while squash offered vitamins and helped retain soil moisture. Sunflowers were cultivated for their seeds, which were consumed and used to extract oil. Together, these crops played a crucial role in their sustenance, culture, and trade.