When does overpopulation occur

Overpopulation occurs when the number of organisms located in an area cannot be supported by the local resources. In human populations this happens when technologies allow for an increased level of food production, an increase in the quality of sanitation, and a resulting decrease in the rate of death from disease.

Explanation:

lolz

when their not enough resourses to sustain a population

Explanation:

trachea, alveoli, lung capillaries, arteries

the actual answer was 160934