Final answer:
The National FFA supports students interested in all aspects of agriculture, not just farming. The Southeastern United States was an independent center for plant domestication. Sharecroppers were tenants who paid rent with crop shares.
Step-by-step explanation:
The statement that the National Future Farmers of America (FFA) organization supports only those interested in going into farming is false. The FFA is a youth organization that supports students interested in the broad field of agriculture, which includes farming but also encompasses science, business, and technology in agricultural sectors.
The present-day Southeastern United States was likely one of the world's independent centers for plant domestication, which is a true statement. This region saw the early domestication of various plants that have become staples in diets worldwide.
The system of sharecropping involved tenant farmers paying their rent with shares of their crops, which is also a true statement. This was a common practice in the American South following the Civil War and into the 20th century.