No safety is necessary everywhere...the streets, your home, car driving.... elaborate on the question
To protect you.
they called out the military when necessary
The necessary safety precautions when conducting an experiment depend on what is done during the experiment and where it is done.
Laws are necessary because some people are thoughtless or greedy and do only what they want without thinking of the health and safety of others.
It is necessary because without the safety rules, an experiment could go wrong and cause damage or seriously injure someone.
atlas
It does not matter whether it is preschool or any other activity, health and safety are necessary because no one wants to become sick or be injured, or to have that happen to their children.
Safety symbols inform you or hazards or necessary precautions and prevent you from falling into danger.
Health and safety are necessary because no one wants to be made ill or to be injured, but in complex environments like the workplace, more than "common sense" care must be take to preserve the health and safety of all present.
why is it necessary to keep accurate health and safety records in the workplace
so you don't die.