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

• A
  It helped to study the working of cells.
• B
  It helped in curing diseases caused by cell dysfunction.
• C
  It helped in restating the earlier theories on cells.
• D
  It helped in introducing the use of microscopes to study cells.