When resultant force acting on a body is zero, then body will be in equilibrium.
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Presence of lipids and proteins as phospholipids provide flexibility plasma membrane. This helps cell in engulfing food and other materials from external environment.
Plasma membrane or cell membrane is the outermost covering of the cell that separates the content of the cell from its external environment.
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Purkinje is 1839 coined the term ‘protoplasm’ for the fluid substance of the cell.