Which of the following is an unskilled worker

What is an example of a secondary source?

How did inca develop their road system? a) they used mortar to hold the stones together.b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks.d) they laid roads in the cities, not in the less densely populated deserts.

Why did england's citizens restore the monarchy after the rule of oliver cromwell?