Want this question answered?
Yes,the toilet is part of the plumbing system.
Nothing has replaced the plumbing system under the Colosseum. It is still there.
Same as all other plumbing in civilized countries
Yes, it does
Blueprint, drawing, sketch, etc. that shows layout of piping for plumbing system.
Not necessarily, depends what and where plumbing work is to be done. Check with local plumbing authority about needing license or not. Sometimes you need license to pull permits to do plumbing work. Plumbers usually have at least a journeyman's license.
The electrical system, plumbing system, heating/cooling system and drainage system
Fire sprinklers and supporting pumps are considered "plumbing".
Electric-wiring system
Hydrostatic and pumping
Removing any air in the system.
The only plumbing work that you are allowed to perform without a license is for your own property.