Cells which forms the structural and functional unit of all living organisms is the basic component of all living things.The presence of cell like structure is important for considering an object as living and that is why Viruses are not considered living organism inspite of having a genetic material like living oganisms, because they are not made of cells and lack proper cell like structure. To make new viruses, they have to invade and hijack the reproductive mechanism of a living cell; only then can they obtain the materials they need to reproduce.
Living organisms may contain a single cell or multiple cells but they must have cell, hence cell is the component expected to be found in any type of living organism.
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