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Dependency loads show how a country's population is distributed and how well its dependents are cared for. This ratio can assist a country in formulating policies and forecasting its needs, as well as determining how many people are dependant on each independent person which is vital to be aware of.  Birth rates are an important measure in overall health science since they reveal a lot about community health. One of the most basic and important indicators in demography is the birth rate. Birth rates influence public policy and spending for education and health care, and they can have a significant impact on a country's population's well-being. Life expectancy is a more intuitive measure of mortality than death rates and is a useful and significant summary measure of mortality. Life expectancy is a common  key measure for assessing a community's overall health. life expectancy is the most important metric for determining population health.

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                         WHAT IS WHERE? 

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                         WHAT IS WHERE? 

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Two of the three pyramid populations (Nigeria, Canada, and Japan) have something in common, namely the life expectancy of Japan and Canada. As you can see in the pyramids, Canada and Japan have a similar percentage distribution, especially at the top. Constructive, expansive, and stationary pyramids are the three types of pyramids. Nigeria is expansive, Japan is constructive, and Canada is a stationary pyramid, in my opinion. What is where also includes " life expectancy, dependency load and birth rate.

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DEFINITIONS : ( Life expectancy, Birth rate & Dependency load ) 

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DEFINITIONS : ( Life expectancy, Birth rate & Dependency load ) 

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Life expectancy:  The amount of years a person can expect to live is referred to as "life expectancy." Life expectancy in a given year can be thought of as the average age at which a person born that year would expect to die if the average age of death did not change over their lifetime. It's similar to a speculative estimate of how long a human might live.
Birth rate: The total number of live births per 1,000 population divided by the number of years in the period is the birth rate. The term "birth rate" can also refer to the fertility rate or the natality rate. The ratio of births to individuals in a given population and time is known as the birth rate.
Dependency load:  Age, rather than employment status, determines the dependency load. between the ages of 14 and 65 years old.

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                            WHY IS IT THERE? 

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                            WHY IS IT THERE? 

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In these 3 population pyramids there are more differences than similarities but there are a few i can tell you. Starting off is that the Japan & Canada have a very close population even just by eyeing it but if you look at the percentages there are very close to number with each other for example ill tell you one of them... Japan from ages 40 - 44 have a percent of 3.3% and so does Canada.

It's very common that countries have patterns of fertility and mortality rates because it all depends on how the person carries them self, there health issues and there prosperity.