Organism - An individual form of life that uses energy to carry out activities., Unicellular - Consisting of a single cell., Multicellular - Consisting of many cells., Microscope - An instrument that uses lenses to make an object appear bigger than it really is., Bacteria - Tiny single-celled organisms., Scientific Theory - A widely accepted explanation of things observed in nature and it must be supported with evidence., The Cell Theory - Every living thing is made of one or more cells. Cells carry out the function needed to support life. Cells come only from other living cells.,

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