Which one of the following has a long-term effect on the health of an individual?

List any four essential factors that must be taken care of by an individual for keeping good health.

Which one of the following diseases is caused by protozoans?

Classify the following diseases into communicable and non-communicable diseases:
$(a)$ Cancer
$(b)$ High blood pressure
$(c)$ Common cold
$(d)$ Diabetes
$(e)$ Tuberculosis
$(f)$ Night blindness
$(g)$ $SARS$
$(h)$ Typhoid
$(i)$ Cholera
$(j)$ Dengue

Give two examples for each of the following:
$(a)$ Acute diseases
$(b)$ Chronic diseases
$(c)$ Infectious diseases
$(d)$ Non-infectious diseases

Making anti-viral drugs is more difficult than making anti-bacterial medicines because