Frustration often causes?
a. perseverance.
b. reinforcement.
c. obstacles
d. aggression

What makes water a renewable source

How has our understanding of the first sentence of the declaration of independence changed over time?

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 .