The overall population of a species has increased. What could have occurred to allow this to happen? The emigration rate is greater than the death rate.
The death rate of the population is greater than the immigration.
The birth rate of the population is less than the death rate.
The immigration of the population is greater than the emigration.

Explanation:

The graph shows that the human population is increasing every year. This is because the number of births each year is much greater than the number of deaths. ... As the population increases, the yield of food from farming will also have to increase or malnutrition and starvation will occur.

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.

i'll try what topic lol