write something about viruses?
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Viruses are a type of microorganism which are not given any proper space in the system of classification. There are many viruses that cause diseases in the human and animal body.
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viruses are smallest biological agent which causes different diseases in all organisms. we cannot see viruses with our naked eyes these can only be seen by microscope.these can cause most toxic diseases like coughing , sneezing, runny or stuffy nose , fever..
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