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   ocr: SIMPLE ORGANISMS IMPLE ORGANISMS are viruses DNA to reproduce. Viruses cause many 2O and one-celled organisms, plant and animal diseases; unless the such as bacteria, blue-green algae, organism can protectitself, the virus and protists. spreads to cause illness and even death. Viruses are on the borderline between living and nonliving things. They are not true cells but simply BACTERIA genetic material surrounded by a DIVIDING protein coat. Viruses do not show life activities unless they - are inside a living cell. They use their host's Protein coat Virus This virus causes viruses influenza. c ...