The use of submarines during world war i had which of these effects? it gave an advantage to the coastal nations. it made naval battles the key battles of the war. it made it difficult for merchants to bring supplies to the allies. it prevented the central powers from transporting troops.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b

the french revolution was when many people were persecuted for disagreeing or making separate government