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As of 2010 census 61% of the population (7,978,264) livein rural areas, while 39% of the population (5,068,234) live in urban areas.
North America has about 7% the world's population and accounts for 1/3 of the world's economic output.
Eatimates of the worlds population was about 150 million.
about 6,894,000,000 (2011)
Wikipedia has several lists of all the different dolphins one dolphin is the bottlenose dolphin