What tools might a scientist use for an experiment about the mass of objects?

What is the main subject of this map? a. world war i in europe b. nazi aggression in europe c. world war ii in europe d. europe during the cold war

Brainliest to who answers! what will always cause a supply curve to shift to the left?

This was an act of continental congress which initially organized the first united states territory and was to be the basis for governing how the united states would expand westward.