True, the number of Representatives depends on the population of a state.
The answer is D. <span> invention of the first steel tools
Actually, this very topic is still a hot debate among scientists because the shift happens on different reasons in each region of the world.
But one thing they have in common is that Steel tools give the member of early societies the capabilities to rake uplands and cutting up crops that really useful in farming and herding.</span>
Building dams on the Chagres river to create Gatun lake
That's A, President Franklin D. Roosevelt. The topic you're asking about is extremely important. I would delve into a bit more research. I can't remember why FDR but I did the test a while back and got an A.