An atlantic crossing by boat from england to new england took 60–80 days in the 18th century. in the late 19th century the voyage took less than a week. how do you think these time differences for travel might have impacted the spread of infectious diseases from europe to the americas, or vice versa?

answer: populations of walruses and polar bears will decline

explanation:

you put it

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a