When you say "protection from harm system," I assume you mean the Integumentary system. It's job is to protect the body from various kinds of damage. Hope this helped! :)
Choice A (all exercise) would be the correct answer.
Please give the following statements
A bal of .12 reduces the distance a pedestrian can be seen by a driver by about <span>20%.</span>
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).