If it ain't broke don't fix it
Copper
Because you will then get a 'galvanic reaction'.
Yes, copper pipes are used extensively in plumbing.
For basic plumbing fittings, either copper or brass fittings is your best bet. Copper is more for just water lines, and brass is for various uses, but more expensive. Sites like DrillSpot.com are great places to start looking.
When it comes to a plumbing fitting, description CxC means the fitting is Copper by Copper, or the fitting is used to join two pieces of copper
No! Steel is a very bad choice for plumbing, as it rusts and can poison your water. PVC, copper, or clay pipes are recommended for plumbing.
That woulld depend on the piping materials and local codes as copper TYPE L , K or M should not be threaded and plastic piping should NEVER be lead wiped to a brass ferrule and Cast Iron should not be glued
No; green hair is caused by copper pipes. Just rinse your hair in water that has not gone through the pool plumbing after swimming.
it is used for plumbing
It is a copper pipe used in plumbing.
They used lead and clay plumbing in ancient Egypt.
Copper is NOT good for plumbing. It was once, when there was no alternative. Now many superior products like PEX are available. They are cheaper, more lasting and more efficient to fit than copper.