What will cause a decline in the human population is loss of fish, dirty water, a whole in the ozone layer. These are just three causes that could decrease mankind.
disease.
disease.
This is easy you just go 2 google and that should help you!
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A natural cause of decline in a population could be disease outbreak or an epidemic. Diseases can spread rapidly through a population, resulting in a significant decrease in the number of individuals. This decline in population can occur in both plants and animal species.
well, i think it is due to the killing on them.
The direct cause of the formation of the Bracero Program was decline of the rural population. The southwest saw the biggest drop in this population.
The decline of moose population followed sooner or later by a decline in the wolves population because the is less for the wolves.
Yes, because as we tore down their environment to make space for human homes, we destroyed panda homes, causing a population decline. Plus, our pollution killed off some plants panda's eat, having them starve, causing population decline.
The introduction of diesease by contact with Europeans
Emigration.
The human body begins to decline at an old age or it can decline due to the lack of nutrition.