Question

which of the following is often called as the backbone of modern history? a) iron and steel ,b)copper ,c) bronze ,d) jute​

Answer 1

Answer:

a) iron and steel industry

Answer 2

Iron and Steel Industry is often called the backbone of modern industry. Almost everything we use is either made of iron or steel or has been made with tools and machinery of these metals. Ships, trains, trucks, and autos are made largely of steel.