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Analysis: Angola has the highest population out of the three countries. Making Canada the lowest at 4.9%, Italy at 3.9% and Angola with 17%.

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Analysis: Italy has the highest life expectancy (12.7%), Canada is the second highest (8.6%) and Angola has the lowest (1.5%).

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Analysis: Angola has the highest dependency load (47.4%), Italy is the second highest (37.5%), and lastly, Canada is the lowest at (35%).

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Differences in life expectancy, birth rate and dependency load between countries can be associated with variety of factors including healthcare, infrastructure, education, cultural significance, access to resources, etc.

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1. Life expectancy: Life expectancy refers to the average years a individual is expected to live, based on data and factors such as demographics, lifestyle choices, and health conditions.

2. Birth rate: Birth rate refers to the number of live births per 1,000 people in a population within a given period. Its key demographic indicator is used to access population growth and fertility rates in an area.

3. Dependency Load: Dependency load is a demographic measure that compares the size of the dependent population to the economically productive population.

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Information like this is important because it creates a detailed data-based pyramid that helps us create advanced well-made solutions that may occur in the future. It is important to understand the meaning of each because these topics are different in their way and we should take the time to understand that these topics are still being researched today. These topics are just as important as the daily news for example.