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an increase in the spider population
There are many contributing factors that could be the cause for a decrease in fox population. Over population, not enough food, disease, or over hunting or poaching any of these could be the reason for a decrease in the population.
deforestization or the destruction of owl habitats could cause a decrease in an owl population. This would then mean the owls prey, such as a field mouse, would flourish and increase in population.
the cause of the insect population increasing is that the animals are becoming extinct.
A sudden decrease in the butterfly population would cause a corresponding decrease in the chameleon population since they no longer have enough food.
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.
Death and migration are factors that can decrease hare population.
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.
i do not know this sorry not
the climate
the climate
The loss of habitats has resulted in a clear decrease in diatom species