Diseases can be caused by

Microbes

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Malfunction of a body organ

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Defective genes

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All of the above

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Solution

The correct option is D All of the above
Diseases can be caused by microbes, malfunction of a body organ, defective genes.
Examples of diseases caused by microbes are influenza, flu. measles.
Examples of diseases caused by malfunction of body organ are cancer, arthritis
Examples of diseases caused by defective genes are cystic fibrosis, sickle cell anemia

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