Japan has one of the world's highest life expectancies. However, it has experienced a net loss of population for many years, which is the result of declining birth and immigration rates. The population did rise in both 2008 and 2009, largely due to Japanese citizens abroad returning home. This data was likely analyzed by a

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A demographer is a social scientist who studies the characteristics of human populations, such as size, growth, and distribution. In this scenario, analyzing the trend of population growth and decline, and identifying the reasons behind it, is the job of a demographer. The other options, such as social ecologist, environmental sociologist, and nongovernmental organization, are not as relevant to this scenario.

Japan Has One of the World's Highest Life Expectancies