Question

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

Answer 1

I think you mean why does the body expend the energy and nutrients to keep producing new cells when there are pre-existing cells.

That is a good question because it helps you understand that the processes most cells go through create a lifespan for cells — that is 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.

Answer 2

somatic cell divide to form a new cell for repair and growth a foetus developed by this form a signal cell after fertilisation. so formation of new cell after pre existing cell is basic of life