The approximate number of humans on Earth in 2012 is 7 billion.
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Q57: Food production and consumption are not well
Q58: Once a population reaches its carry capacity,its
Q59: Population size is affected by both density-independent
Q60: If there are 100 people living in
Q61: Although it happened long ago,the story of
Q63: Pollution is one of the many density-dependent
Q64: When an S-shaped growth curve levels,it is
Q65: The carrying capacity of a habitat always
Q66: Humans appear to be the only species
Q67: Natural disasters can limit population growth in
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