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The cell theory states that :
-all plants and animals are made of  cells
 -cell is the basic unit of life
 it was prepared two biologists scheiden in 1838 and schwann in 1839
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Cell Theory was proposed by Schwann & Schleiden in 1839.
The Cell theory states that:
i) The cell is the smallest unit of structure of all living things.
ii) The cell is the unit of function of all living things.
iii) All cells arise from pre-existing cells.
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