What is meant by "citing a source"?

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 .

Which states universal prekindergarten has been most effective in preparing children for school?

The internet enables people to make better economic decisions because they can do which of the following