The fundamental unit of life Cell - 9th Class Science online notes Class 9 Science Cell : A cell is capable of freelance existence and may do all the functions that square measure necessary for a living being, like nutrition, respiration, excretion, transportation and A cell may be a elementary unit of life since living thing organisms square measure capable of freelance existence that shows a cell’s ability to exist severally. All living beings are composed of the fundamental unit of life, i.e. cell. Cell theory: projected by M. J. Schleiden, Schwann, and Rudolf Virchow, that states that All living organisms are composed of one or more cells. Shape and Size of Cells:- Cells come in all shapes and sizes. While most of the cells are spherical in shape, cells of various other shapes are also found. Most of the cells are microscopic in size, i.e. it is impossible to see them with naked eyes which can be seen through microscopic, since these microscopic organisms.
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