Question

what is the use of formation of new cells by the division of the pre existing cells

Answer 1

Cellular activity for most cells ends up with the end of a cell’s life and the need for that cell, as its final act, to produce new cells through the transfer of its DNA so that the new cells can begin their time at the beginning of that life cycle. The body then has a system for disposing of the old non vital cell.

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Answer 2

Human body will reach the end point (death), if a new cell doesn’t take the existing place of a dead cell. It is one of the important function of human body.  In order to keep the human body functioning the cells in the human body form new cells by dividing itself.

Cells are mortal and so we are. We die one day but thousands of cells in our die every day by replacing a new cells in its place.  

Before dying, the existing cell reproduce a new cell by transferring a copy of its DNA in order to preserve its function and data in the human body.