We should not allow mosquitoes to breed in our surroundings because they

Why do some children fall ill more frequently than others living in the same locality?

Which disease is not transmitted by mosquitoes?

Explain giving reasons:
$(a)$ Balanced diet is necessary for maintaining a healthy body.
$(b)$ The health of an organism depends upon the surrounding environmental conditions.
$(c)$ Our surrounding area should be free of stagnant water.
$(d)$ Social harmony and good economic conditions are necessary for good health.

During a disease:

Label the modes of disease transmission from $(a)$ to $(f)$ in the provided diagram.