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Across 4. a living thing that a virus or parasite lives on or in 5. an organism that consists of a single cell that does not have a nucleus 6. the biological treatment of hazardous waste by living organisms 8. reproduction in which one single-celled organism splits into two single-celled organisms

Down 1. contains genetic material and proteins and is covered by a thick, protective coat 2. bacteria that cause disease 3. medicine used to kill bacteria and other microorganisms 7. a microscopic particle that gets inside a cell and often destroys it