Answer:
there will be economic growth when there is an increase in labor supply
Well sometimes you may not have access to a document that was made during the same time period as the historical subject that is being studied. Therefore, a secondary source would be better to use to understand more about subject you are studing.
Science challenged spiritual beliefs because science says we weren't on the earth since it's beginning but spiritual beliefs do.
The two principles of the federalism and separation of powers and checks and balances and you will have to decide what they mean for you because I am not you so I can not answer that but hope this helps
