Strength, cheapness and the ability to be easily formed or "moulded".
However, increasingly, a lot of car bodies incorporate fibre glass, plastics, carbon fiber and other composite materials.
Iron
The ferrous metal commonly used to make car bodies is steel. Steel is chosen for its strength, durability, and formability, making it ideal for providing structure and protection in automotive applications.
Strong and lighweight metal used for contrruction of airplanes.
Steel
No, fiberglass is not metal. It is a composite material typically made of glass fibers embedded in resin. It is lightweight, durable, and commonly used in various applications such as insulation, boats, and car bodies.
Too expensive
Almost always it is aluminum.
Sheet metal used on older car bodies typically ranges from a gauge of 16 to 18. Sheet metal used on the auto body of new vehicles and when aftermarket body work is performed tends to be between 20 and 22 gauge.
it is because they are a malluable, waterproof, good conductor of heat metal.
Electrum
Depends on what car it is, and where the car is made
Copper is almost always used in car wiring.