Final answer:
The Caddo people drying vegetables for winter storage is true, and the Southeastern United States was an independent center for plant domestication, which is also true. Refrigerated and ventilated storage facilities help preserve food.
Step-by-step explanation:
The statement about the Caddo people drying vegetables for winter storage is true. This preservation method does indeed make the vegetables flatter and easier to store, ensuring food availability during the colder seasons.
Independent Centers for Plant Domestication
The region of the present-day Southeastern United States was indeed one of the world's independent centers for plant domestication. This is true, as evidenced by the cultivation practices in the Eastern Woodlands, where native groups like those in the Caddoan society were involved in domesticating plants such as sunflowers and squash long before European contact.
Fruit and Vegetable Storage Facilities
Regarding storage facilities being refrigerated and well-ventilated, these conditions are advantageous because they help preserve the food by slowing down the decay process and keeping the food fresh for longer periods.