Early society Japan was isolated due to geographic isolation from the rest of the world, which basically means that due to natural barriers between other civilizations. (in this case, natural barrier of oceans since Japan is a chain of islands or an archipelago)
I think that the beginning of the question says "ill health"
Yes, this is true. low earnings are often correlated with bad health - it's because poor people have less access to health care, less access to healthy food and might be forced to do jobs which are stressful and demanding.
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Developmental science is an interdisciplinary scientific field that synthesizes perspectives from biology, psychology, and sociology in order to understand behavioral and psychological aspects of human development.
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The heat equation can be written as. ∂ u ∂ t = α ∇ 2 u. where u(x, y, t) is the temperature field that varies in space and time, and α is the thermal diffusivity constant.
