Trade blocs help countries by limiting competition.
increasing barriers to trade.
improving product production.
allowing the pooling of resources

d.summerains, the last one

first second and third

explanation:

the answer that best explains what happened to george washington at fort necessity, pennsylvania is : washington was attacked by the french but was able to negotiate with them to peacefully end fighting. the battle took place on july 3, 1754. the battle is considered as being the start of the french and indian war.

food chain i would say only because there is competition on getting food and survival