Iron needs to be heated to a much higher temperature to find and mold
requires a very high temperature to melt
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Iron and Brass foundry. Later developed into Revere copper company
most of there sheilds were made of copper. later on they found steel and iron by the Assyrians and used that for shield and weapons.
Bronze was used before iron because it was easier to make by combining copper with tin. Bronze weapons and tools were stronger and more durable than pure copper implements, making it a preferred choice for early civilizations. The technology and knowledge required to extract and work iron were developed later, leading to the transition from bronze to iron usage.
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This would be the Chinese hand cannons that they developed during the late middle ages for fireworks purposes later changed to weapons of war.
because they did
Early Roman helmets were made of brass, a malleable alloy of copper and zinc. Later helmets were made of bronze, a very strong, hard alloy of copper and tin. Still later some helmets were made of iron, which is not as strong as bronze but was easier to find. The Romans worked some of their iron with carbon, but they are not thought to have developed true steel.
Antibiotics were developed in the 1920s and later commercialized in the 1940s.
Cancer is usually developed later in life, but there are rare cases where a person can be born with cancer.
1983 and later - copper plated zinc. Some 1982 coins were all copper and some copper plated zinc.