Which of the following is a characteristic of science? it cannot be repeated. it asks questions that cannot be tested. it is done by only one scientist at a time. it uses data and observations to make conclusions.

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 .