Adiagram of relationship between current and potential difference

Which choice best describes the general trend for the countries shown, for the period 2008 - 2010?

How did ancient civilizations develope its agriculture and protect its population

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 .