give reason for the following
1) hand must be washed before eating a food
2) housefly is considered as public enemy no 1
3) saline water injection is a must for Cholera patient
4) Gambusia fish help in mosquito control
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1 ) because in our hand lot of germs and bacteria
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Bcz hand may contain bacteria
Housefly spread various disease
Gambusia fish eats the mosquito eggs
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