The answer is 'A. consequence'
Good workout and proper health
it’s their job
Up your daily calorie intake by 300 to 350 calories per day — that's the equivalent of, say, two glasses of skim milk and a bowl of oatmeal (not the all-you-can-eat sundae bar you were envisioning).
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
If this is multiple choice then I am sorry this is not the answer you are looking for but all of these substances are in breast milk.
