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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.
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∙ 14y ago
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What are two factors that increase population size and two factors that decrease population size?
Increase: Survival and Immigration Decrease: Death and Emigration
Can the population increase and decrease at the same time?
no
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
After a rabbit population reaches the carrying capacity of its habitat the population of rabbits will most likely?
alternately increase and decrease
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. (:
An increase in a predator will directly result in?
A decrease in the prey population
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
