Biology, 01.10.2019 06:30, Gearyjames8

According to the u. s. census bureau, philadelphia had a population density of 11,379.5 people per square mile in 2010, while the entire u. s. had a population density of 87.4 people per square mile. which best explains the contrast between these two population densities?
while most areas of the u. s. have a high population density, the u. s. encompasses a vast amount of land.
the birthrate decreased throughout the u. s.
while some areas of the u. s. have a high population density, others must have extremely low population densities.
all of the above are correct.

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According to the u. s. census bureau, philadelphia had a population density of 11,379.5 people per s...