It's true cause a child has an developing immune system whereas adults have that already developed so the children under development are more likely to have those problems.
Answer:
It is necessary for having a positive attitude.
Explanation: your welcome
Its has to be C
cause D is dealing with water
now B makes sense cus because a member of a population will be affected by a diesise (definition)
and A makes 1% sense its kinda the samething as B dealing with infections
now C. deals with mesquitos
