Cell theory states: all living things are composed of one or more cells; a cell is the smallest unit that still retains the properties of life; and new cells only come from cells that already exist. Based on cell theory, why is a virus considered non-living? A) A virus does not have a nucleus. B) A virus does not contain genetic material. C) A virus is too small to be considered a cell. D) A virus cannot reproduce itself without a host cell.
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