| Class 9 Biology Why Do We Fall Ill | Introduction |
Introduction
The condition of body to function physically, socially and mentally well is called its health.
A body with good physical and mental condition we call it a healthy body. It is not just a body free from disease or weakness but a state of thorough physical, mental and social well-being.
A particular abnormal condition or function affecting the part or the entire organism is called a disease.
A body infected with a disease is called a diseased body.
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