H E L P 1. Which of the following is NOT true about the Mound Builders? A. They had and used slaves. B. Their culture flourished for 6,000 years. C. Their mounds were religious symbols, graves, and for religious practices. D. They lived in large cities. 2. Which of the following is NOT true about the Plains Indians? Question 6 options: A. They relied mostly on the buffalo for food and materials for everyday life. B. They adopted the horse to make hunting and traveling easier. C. They did not often travel, and established large permanent settlements. D. They lived in a flat, rolling, grassland region.