Answer:
If you eat more calories than you use, you will gain weight; conversely, if you eat fewer calories than you use, you will lose weight. The Academy of Nutrition and Dietetics' Healthy Weight Gain website provides some information and advice on how to gain weight and remain healthy.
Explanation:
How is diet related to calories?
It belongs to the Organ System
Prokaryotic cells do not have a nucleus.
Eaukaryotic cells do have a nucleus.