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Which are two ways a population can decrease is size?
Some of the population could die, and some could move away from that area
What are the four criteria for a population?
Population density, Immigration, Emigration Exponential Growth
Why population increase and decrease?
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 are four main characteristics of a population?
Birth Rate, Death Rate, Immigration, Emigration
The rate at which population size grows or declines depends on the rate of what?
births, death, immigration and emigration
Does emgration effect on population size?
That depends on the balance between birth rate, death rate and emigration rate
Is it better to have a higher death rate?
No because when the death rate is higher than the birth rate, the population will decrease.
What is it called if the birthrate and death rate are equal?
Population stabilization: Common term for zero population growth, in which the birth rate equals the death rate and in addition where net immigration equals net emigration so that the population does not increase or decrease over time. Usually used in the context of stabilizing increasing populations.http://www.susps.org/overview/population_terms.html
What situation in which the birth rate plus immigration equals the death rate plus emigration is called?
zero population growth
Population growth rate definition?
Population growth rate is the rate at which populations change in size over time as a fraction of the initial population. The formula used to measure growth rate is (birth rate + immigration) - (death rate + emigration).
What happens to a population when the death rate decrease's?
Birthrate Usually Increases.
What are four factors that affect the size of population?
1) Death 2) Birth 3) Emigration 4) Immigration
