Answer:
As populations transition from rural to urban living, many social changes take place. For example, as people move to urban environments, they tend to live in closer proximity to each other. This presents problems when it comes to sanitation and hiegiene.
Explanation:
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The biosphere is composed of all living organisms. Biosphere is a region of the earth's surface where all living organisms are able to live.
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You didn’t give any options but i’m assuming it’s “oxygen”
