Question

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​

Answer 1

1 ) because in our hand lot of germs and bacteria

Answer 2

Bcz hand may contain bacteria

Housefly spread various disease

Gambusia fish eats the mosquito eggs