What is disease Write any two reasons for this.
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Infectious disease are disorders caused by organisms - such as bacteria , viruses, fungi or parasites .Many organisms live in and on our bodies.
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The disease is a condition in organisms that are associated with the abnormal functioning of organs and systems of the body. Types of diseases are given below -
- The disease can cause disorder of function and structure of an organism, which is usually evident by the appearence of related symptoms.
- The disease may occur due to infections or wrong lifestyles. These diseases can be categorised as immediate and contributory causes respectively.
- Contributory cause includes polluted environment, unhealthy lifestyle etc.
- Examples of diseases are common cold, chickenpox, diarrhoea, allergies.
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