The hypothesis can be tested by visiting different countries and measuring the amount of carbon dioxide in the air and noting the countries' respective population density and total population. Compare the results of carbon dioxide in the air of countries that have a higher and lower population and population density.
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Answer:
The hypothesis can be tested by visiting different countries and measuring the amount of carbon dioxide in the air and noting the countries' respective population density and total population. Compare the results of carbon dioxide in the air of countries that have a higher and lower population and population density.