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Populations increase and decrease because people leave one country (emigration) and enter another (Immigration). A rise or fall in either the Birth Rate or Death Rate in a country can also cause populations to increase or decrease.
What else can I help you with?
What are two factors that increase population size and two factors that decrease population size?
Increase: Survival and Immigration Decrease: Death and Emigration
Did the population of north America increase or decrease from 1830-1840?
increase
Reasons for rapid increase in population?
Immigration, decrease in infant mortality, increase in birth rate, decrease in mortality.
What could cause a decrease in insect population?
an increase in the spider population
An increase in predator population will directly result in?
A decrease in the prey population
What is one effect of effect of immigration on population living in an ecosystem?
The population will decrease-- APEX
How will this effect the ecosystem as a whole?
The shrimp population will increase which will cause an increase in the squid population.
What leads to a growth in population?
a decrease in preditors, an increase in natural resorces, or an increase in happiness. (:
What impact will an increase in mouse food have on the mouse and rabbit populations?
rabbit population will decrease while the mice population will increase
An increase in a predator will directly result in?
A decrease in the prey population
Did the Muslim population increase or decrease over the past years?
The Muslim population has INCREASED.
Why will the population of frogs decrease of the population of snakes increase?
Because the snake's will eat the frogs.
