The welfare of your society depends on your well being because you are the human being that can shape the society you choose to live in, therefore making it your own society. Your well being is the main factor, that includes mental and physical health. If your wellbeing isn't healthy the society you choose to live in will be unhealthy also, same vice versa.
Nobody plans it, it just happens
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That's good I would've put the same thing ngl
A. What type of information you are looking for. The rest can be answered when doing the internet search.