Question

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:

Population growth occurs when the combined factors adding individuals (births, immigration) exceed those removing individuals (deaths, emigration). Let's analyze each option:

1. Higher emigration than death rate would reduce or not grow the population, as more individuals are leaving than dying.
2. Higher death rate than immigration means more individuals are lost than gained via immigration, which would not cause growth.
3. Lower birth rate than death rate leads to a net loss of individuals from the population, causing decline.
4. Higher immigration than emigration means more individuals are entering the population than leaving, which contributes to an overall population increase.

Answer:

The immigration of the population is greater than the emigration.