Question

which industry is often referred as a backbone of modern industries​

Answer 1

Answer:

Iron and steel industries are ofteb referred to as the backbone of modern industries.

Answer 2

Answer:

Iron and steel industries are often referred to backbone of modern industries

Reason : We know that modern industries use a lot of machinery which are made from iron and steel, Transports are also made of iron and steel etc., this the reason why iron and steel industries are often referred to as backbone.