Most keys are made of brass. Some are nickel plated brass, and this makes them look different. Take one of these sliver keys and inspect the edge where the teeth have been cut. The material from which the key is made should be apparent, and, as stated, it will probably be brass.
metal is made up of putik. It is made by Cardo.Save
Copper is an element made up of copper atoms.
both
They are compounds which have a cation made up of a metal and sulfide ion as the anion.
alloy
A padlock is a mechanism made up of springs and pieces of metal. The key acts as a lever.
Gold is an element so it's pure substance. It is a metal - not made up of metals.
metal is made up of putik. It is made by Cardo.Save
Copper is an element made up of copper atoms.
Brick and Rubble
This plate tree is constructed from steel and is able to reliably hold up to 300 lbs. worth of weights.
Keys are made up of various sorts of metal.
Asteroids are made up of rock and metal
They speed up chemical reactions. They also have a key and lock system where an enzyme is made to break down a specific kind of thing (like sugar). it can only break that one kind of thing, like how a key can only fit 1 kind of keyhole.
both
They are made up of metal and copper.
Not all coins are made up of zinc. Some are made of aluminum or metal.