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The basic structural and functional unit of all living organisms is the:

ATissue
BMolecule
CAtom
DCell
Answer & Solution
Correct answer: D. Cell
All living organisms — single-celled (bacteria, amoeba) and multicellular (plants, animals) — are made of cells. Cells perform all life functions (energy use, reproduction, response to environment). The cell theory says: (1) all living things are made of cells; (2) cells come from pre-existing cells; (3) the cell is the basic unit of structure and function.
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