state four major factor 's which causes diseases
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(a) Infection by micro-organisms (bacteria, virus, fungi, protozoa) and worms; cause communicable diseases.
(b) Malfunctioning of body organs; non-communicable diseases like diabetes and heart diseases are caused by the malfunctioning of pancreas and heart respectively.
(c) Deficiency of one or more nutrients;goitre, marasmus and kwashiorkor are such diseases.
(d) Genetic factors present from the birth of the individual; haemophilia is a genetic disease.
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