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cell - The basic unit of structure and function of living things.
microscopic - Too small to be seen without using a microscope.
organism - Any living thing that maintains vital like processes.
cell membrane - The thin covering that surrounds every cell.
nucleus - The part of a cell that directs all of the cell's activities.l
cytoplasm - the jellylike material inside a cell between the cell membrane and the nucleus.
protist - A simple, single-celled or multi-celled organism with a nucleus and organelles.
tissue - A group of cells that work together to perform a certain function.
organ - A group of tissues that work together to performm a certain function.
organ system - A group of organs that work together to do a job for the body.
digestive system - The organ system that turns food into nutrients that body cells need for energy, growth, and repair.
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