Answer:
I would be emotion stableibilty. <-- That is spelt wrong, sorry.
An example of positive peer pressure is someone cheering for another to push harder, keep going, at a sport.
This motivates the student by his/her friends to continue going. If so, they and their friends will feel quite triumphant.
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The system responsible for regulating metabolic activities of the body would be the Digestive system because it breaks down the food to store in the body to make body fat and to get rid of through waste.
Short Answer: The Digestive System