Name the four factors that affect population growth. then, explain how each factor contributes to population growth.

There are four major factors that affect population growth:

Birth rate: The number of births per 1000 people in a year. This has a positive effect on population growth. This makes sense, as people being born adds to the population.

Death rate: The number of deaths per 1000 people. This has a negative effect on population growth. People dying lowers the total population.

Immigration: The number of people entering the population. This has a positive effect on population growth. People entering the population increases it.

Emigration: The number of people leaving the population. This has a negative effect on population growth. People leaving the population decreases it. 

Birth rates, death rates, immigration, and emigration are the factors that greatly affect population growth.

The four factors that affect population growth are birth rates, death rates, immigration, and emigration. If the birth rate is higher than death rate, population tends to increase while on the other hand, if death rate is higher than birth rate then the population tends to decrease.

If more immigration and emigration occurs in a country then its population increases whereas decrease in population of that country from which they are migrated so we can conclude that birth rates, death rates, immigration, and emigration are the factors that greatly affect population growth.

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stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms