Answer:
Disease refers to any condition that impairs normal functioning
of the living organisms. It may be a response to environmental factors,
specific infective agents or inherent defects of the organisms.
Types of disease are
(i) Acute or chronic (on the basis of duration).
Example of actue diseases are common cold and cough, while
examples of chronic diseases are diabetes and elephantiasis.
(ii) Infectious and non-infectious (on the basis of causal
agent). Examples of infectious diseases are influenza and pneumonia, while
examples of non-infectious diseases are cancer and diabetes.
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