Cell - the smallest structure of any living thing, Tissue - groups of cells form, Organs - groups of tissue form, Systems - groups of organs form, Organelle - structure in a cell, Cell Membrane - controls what enters and exits the cell, Nucleus - the brain of the cell, Nucleolus - located inside the nucleus, Mitochondria - makes energy for the cell, Cytoplasm - gel-like substance that contains many organelles, Cell wall - only found in plant cells,

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