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Affects especially those in poverty

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Unsafe conditions can affect the immigration and emigration

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Safe drinking water can affect the population size by either increasing or decreasing it depending on the amount there is

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Nutritional value of food and the quantity

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Decreases population when people decide to leave the country

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Different things affect the death rate in a country; sickness, old age, murder, etc

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Reproduction rates increase the size of the population

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Immigration to a country or city increases population size

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Different types of illnesses can affect the population, those who do not have access to medical care are more affected by this which decreases population size