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What is CELL? Discovery, Types, structure and Functions of cell?

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Cell   is the basic unit of living organism. It is a small mass of cytoplasm (fluid present inside the cell) containing nucleus with functional organelles and these organelles are covered by cell membrane either single membrane or double membrane.                                 A double membrane cell Discovery- In 1665, Scientist ROBERT HOOKE examined thin slice of cork under a primitive microscope. This microscope was assembled by Robert Hooke itself. He saw small, empty space or compartments and called them c ellulae . Now the term is refer as Cells.    From 1675 to 1680, Anton von Leeuwenhoek designed the simple microscope and studied many of cells like sperm cells, bacteria, red blood cells and protozoan. He was a Dutch merchant and pursued microscopy as a hobby. In 1772, Alfonso c orti noted the living material in the cell. The nucleus of cell is discovered by Robert Brown in 1831 and he also found that the cell is surrounded by a membrane that is cell membrane.    The