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प्रश्न
How do biological disasters occur?
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उत्तर
Biological disasters are caused by germs developed in laboratories and released in the air to kill a large number of people. When these microbes are inhaled by a person or get absorbed in his/her system through a cut or wound, they can infect him/her. Even a few drops of the smallpox or plague virus could start an epidemic, killing thousands of people.
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