Answer: For communities, inadequate shelter and overcrowding are major factors in the transmission of diseases with epidemic potential such as acute respiratory infections, meningitis, typhus, cholera, scabies, etc. Outbreaks of disease are more frequent and more severe when the population density is high.
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Answer:
we knew how to make it in nature thousands of years ago but not that well
but then today we know how to in our home's and if we tried we wouldn't know that well
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