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The cell theory was given in year 1839 by Schleiden and Schwann. According to this theory all organisms are composed of cell and cells are the basic unit of life.
How did this theory help in the field of science?

A. It helped to study the working of cells.

B. It helped in curing diseases caused by cell.

C. It helped in restating the earlier theories on cell.

D. It helped in introducing the use of microscopes to study cell.