How did Augustus Caesar establish the Roman empire's borders? O by using a system of tax collection
O by using a postal service
O by using natural boundaries
O by using merchant ships

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 .