why virus do not show characteristics of life until they enters living body
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Viruses lack any membranes. Hence, they do not show characteristics of life until they enter a living cell and use its cell machinery to multiply. ... Nucleus is not bounded by a membrane and it is called nucleoid.
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Viruses are not made up of cells, hence they cannot remain stable or produce their own food. However, they adapt to their surroundings easily. They cannot do anything on their own until they enter a living cell
Once they enter a living body, (say a human), they use the cell's machinery to obtain energy and multiply.
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