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Birth rate is the number of people born in a population in a given amount of time.

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Life expectancy is the average amount of time people usually live in an area.

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Dependency load is adding the people aged 0-14 and the people aged 65+ to see how much of them is in a population. People in those age groups depend on the ones not there to make money and help them.

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Out of these three countries Canada, Eritrea, and Japan, all of their birth rates are all different. Eritrea has the highest birth rate out of the three while Japan has the lowest. On the other hand, Canada has the middle birth rate, the not lowest and also not the highest.

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Why do differences in life expectancy, birth rate and dependency load exist between countries?

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Why do differences in life expectancy, birth rate and dependency load exist between countries?

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The differences in life expectancy, birth rate, and dependency load exist between different countries because every country is different! They all have different amounts of people living there and also have different resoures. They have different environments too! Every place is different!!

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Why is it important or useful to look at this information now and in the future? 

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Why is it important or useful to look at this information now and in the future? 

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It is important and useful to look at this information now because we can know what the birth rates, life expectancy, and dependency load of each country are and we can tell them apart from each other. We can also know which countries are the best to live in if we want to immigrate in the future! Or we can even try to make changes, make the countries better to live in! It's also important to look at it in the future too because there might be important changes coming in the future that we should know about!

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Between Canada, Eritrea, and Japan, Eritrea has the highest dependency load while Canada has the lowest! This time, Japan has the middle, but for depenency load instead of the birth rate!!

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Again, out of these three Canada, Eritrea, and Japan, Canada still has the middle, but this time is for life expectancy, Canada is not the highest and also not the lowest. Now, for the other two countries, it's the other way around from the birth rates, Japan has the highest life expectancy while Eritrea has the lowest!