How did Germany prevent the United States from shipping goods to the other Allied countries? a. by using u-boats to sink transport ships
b. by using long-range aircraft to attack u. s ports
c. by using u- boats to blockade allied ports
d. by using battleship to sink transport ships
YALL ANSWER IT!!​

Political boundaries are determined by the political party in control at all time true or false

Population parameters are difficult to calculate due to

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.