I will gove brainliest and like your answer, but please HELP ME!!! How did early agriculturalists make sure that their crops were not of poor quality? 1)They built fields next to bodies of water. 2)They only grew one type of crop per field. 3)They built fences around their fields. 4)They rotated the type of crops planted in fields each year.

4

Explanation:

During medieval times serfs who worked in fields would use a rotation system to keep land fertile and more to be planted.

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.