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What are the parts of your house?
Rooms, halls, kitchen.....

What are these made of, in turn?
Hmmm... Walls, Floors and roofs....

And again, what about these walls etc.?
Err... Bricks, cementor clay.



Fine. Ultimately, these raw materials are the basic units of your house. Similarly, the basic units of your body - and of course, all living organisms - are called Cells.

The entire structure of an organism depends on how these cells are arranged and what structure they have. Hence, they are called the structural unit of life. Further to that, a cell can perform almost all the functions that an organism does. Hence, they are called the functional units of life.

Thus, a biological cell is defined as the basic structural and functional unit of life.

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