cells, the smallest units of life that make up living things, unicelular, made of one cell, bacteria, unicelular organisms, characteristic, a feature belonging to something, microscope, a device that lets you see very small things, organization, the structure or arrangements of connected things, organ system, a group of organs that work together to form a function, tissue, a group of cells that work together, specialized, performing a specific job, reproduce, to create offspring

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