Diseases like dysentery, cholera, typhoid etc., are more common in over crowded human settlements. Why ?
Diseases like dysentery, cholera, typhoid etc., are more common in over crowded human settlements. Why ?
$\Rightarrow$ Diseases like dysentery, cholera, typhoid etc., are more common in overcrowded human settlements with poor hygiene conditions.
Due to heaps of garbage, human excreta and animal excreta in open.
$\rightarrow$ because these are infectious diseases that can transmitted from one person to another.
Chances of spread of diseases like cholera, typhoid, $TB$ increases.
In overcrowded settlements there is more chances of transmission of disease from one person to other.
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