Third parties play a highly important role in the: strengthening of the two major parties weakening of the two major parties

The answer is: Strengthening the two major parties"

Third parties very rarely obtained a dominant vote in american election. But, when the third party realized that they had no chance in winning the election, it can opt to join with other major parties.

When this happen, the vote for the third party would be transferred to one of the major party and strengthen its position in the election.

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )