What is the relationship between living standards and birthrates? 1. the relationship is negative at low levels of income, but becomes increasingly positive as incomes rise. 2. they are unrelated. 3. the relationship is positive (directly related). 4. the relationship is negative (inversely related)?

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.

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.