Class 9 Biology | why do we fall ill? | types of diseases(infectious and non-infectious)

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types of diseases (infectious or communicable disease and non infectious or non communicable disease), infectious diseases and infecting agent (virus,fungi, protozoa, bacteria ,worms)
Means of spread of disease-air borne disease, water borne disease ,sexually transmitted diseases, formit borne diseases, spread of diseases through vectors
Category
Health
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