people die or leave to a different place
A low birth rate and environmental hazards are two things that can cause a population to decrease.
A low Birth Rate and environmental hazards are two things that can cause a population to decrease.
Increase: Survival and Immigration Decrease: Death and Emigration
When a living thing is removed from a food web the population of it's predators will decrease and the population of its prey will increase, disrupting the ecosystem of the living thing.
Death - especially war & disease.
Two consequences of the Great Famine of Ukraine were a significant decrease in the health of the population due to malnutrition and starvation, and a decrease in industrial productivity as the workforce was severely impacted by the famine.
A decrease in the birth rate will cause a decrease in population over time.
The population of zoo plankton would decrease.
Death and migration are factors that can decrease hare population.
Population crash
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.
The decrease in population is 900. The Percent change is 900 / 4500 X 100 = 20% Decrease Or = -20%.