No but they do need a permit to work on the property.
Plumbers are in high demand and make good money for their services. You need to get a plumbers license through your State.
In the state of Florida a plumber needs a license to be able to work. If they are working with a contractor, both of them need to be licensed.
Nopeee
In the state of Tennessee you need a lot that has a zoning for a Dealer License.
Hell if I know!
license for plumbing what it looks like
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.
Yes
is a Mass plumbers license transferable to Alaska
Yes. from the Texas Parks and Wildlife. It costs $80
I need to know a few things on license requirements for medical prpfessionals
You do if you are doing it for commercial gain.