Due to cultural beliefs, the Eastern Woodland tribes changed the land's features by A. building burial mounds for the dead. B. building their houses and villages. C. creating battlefields for war. D. cutting down trees to clear farming land.

In a study, people were asked to imagine simple occasions that made them happy and to remember events that made them feel proud about themselves. it was observed that the subjects developed an increasingly positive attitude. these changes are known to be healthy, leading to greater physical activity and reducing unhealthy habits. based on this excerpt, we can conclude that a positive attitude .