Cell is a smallest basic unit of structure and function of body of an organism. The cells are essential and only unit where the body exist. They are large in number and have an interesting story about their existence as follows;
• Cell work different each with its specific roles making an organism to perform more than one activity at the same time.
• Cells of different differs in structure and tasks performed.
• All cells shares some common features like Nucleus, cytoplasm and Cell membrane.
• Every cell exist from the cell present before (pre-existing cell).