Question

Steel cranes can carry heavy steel beams thousands of feet high during skyscraper construction. This is an example of:

Answer 1

The evolution of building techniques is your answer

Because building techniques become better, because of technology and better materials, we can now build steel cranes that can carry heavier things

hope this helps

Answer 2

Hello!

The steel cranes lifting thousands of feet high during skyscraper construction is an example of the evolution of building techniques.

I hope it helps!