"Among our ancestors, those who feared animals, darkness, and heights were more likely to survive long enough to reproduce." The person who believes this espouses the explanation of the development of phobias.

Evolutionary

Explanation:

Since the early days, human has managed to learn and adjust to his environment, worked on developing and nurture the greatest feasible habits and mechanisms for survival.   Survival was of the greatest priority, as prehistoric cavemen were living in a multitude of dangers, varying from infections to wild, starving animals, etc. As per the evolutionary psychology, our ancestors had psychological upsides, transferred these behavioral traits to subsequent generations, culminating in a generation that then had these adaptive behaviors phobias.

the 4th option is the answer

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.