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Birth rate is the ratio between the number of lives born births in the year and the average total population of that year.

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Life expectancy is based on an estimate of the average age that members of a particular population group will be when they die.

The life expectancy between Canada, Japan, and Cameroon is Canada= 8.6%, Japan= 17%, and Cameroon= 0.8% and Canada has the highest life expectancy.

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Dependency load is how many people in a county are not of working age compared with those of working age. The two main population groups are youth population and old-age population.

Comparing the total dependency load between Canada, Japan, and Cameroon the highest dependency load is Cameroon with 44.7% (Canada=35%, Japan= 41.6%)

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A population pyramid can be used to compare differences between male and female populations of an area. They also show the number of dependents (children and, sometimes, elderly people) and general structure of the population at any given moment.

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These population pyramids represent a stable population that will not change significantly barring any sudden changes to fertility or mortality rates. Population pyramids are useful for studying the future of a region as well as examining historical and current population trends.