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Schleiden and Schwann both together discussed Schwann’s hypothesis and they formulated cell theory. The important aspects of cell theory are:
 All living organisms are made up of minute units, the cells which are the smallest entities that can be called living.
 Each cell is made up of protoplasm with a nucleus and bounded by plasma membrane with or without a cell wall.
 All cells are basically alike in their structure and metabolic activities.
Function of an organism is the sum total of activities and interaction of its constituent cells. 
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It is a theory which describes the properties of the cells.These are the basic and functional unit of all organisms.
Three principles of this theory are:
1)All living organisms are composed of one or more cells.
2)The cell is the most basic unit of life.
3)All cells arise from pre-existing, living cells.
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