Answer:
giving a friend a birthday present after they have given you one
Explanation:
<em>Reciprocity</em> means the generosity flows both ways.
<em>Between peers</em> means the participants have the same general characteristic age, education, experience, and so on. <em>Friends</em> are often peers.
According to the dynamic systems approach, human development is a static process. FALSE
Aerobic Exercises is the answer
1.it is affecting in the way that she stopped eating normally and over exercising
2. her eating habits are affecting physical activity and energy levels because she is not getting enough nutrients that her body needs
3. she wouldn't be allow to go on a diet where they cut her calories and stuff because that could be dangerous but she get into a meal plan where she is still getting all her nutrients and not gaining weight