Answer:
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The answer is A, the immune system
The statement that a certain percentage of body fat is essential for the body to function effectively is true. Making, breaking, storing and mobilizing fats is at the core of how humans and all animals regulate their energy. So, fats are essential for energy regulation. There are two types of body fat: storage body fat and essential body fat. Both of them are taken into account when calculating body fat percentage.
Endorphins reducing stress levels
Public safety regulations protect workers because they provide regulations about various aspects of public safety that increase the safety of different job-related possible occurences which could influence how workers perform their job (mostly in terms of their own safety).
