Body Systems - work together to keep you healthy and alive, Cells, Tissues, Organs - make up body systems, Cells - smallest unit of all living things, Tissues - group of cells that work together, Organs - group of tissues that work together , Group of cells - makes up tissues, Group of tissues - makes up organs, Group of organs - makes up all of the body systems , All the body systems - make up the human body, Microscope - what you use to see a cell ,

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