"While DNA-copying mechanisms are not absolutely accurate, they are precise enough to make the generation of variation a fairly slow - Science - How do Organisms Reproduce

Question

"While DNA-copying mechanisms are not absolutely accurate, they are
precise enough to make the generation of variation a fairly slow
process " What exactly does this line mean? Why does the generation
of variation need to be a slow process? Please help

Prateek Jakhar · Accepted Answer

This line means that while DNA copying, the process is not accurate
and their are some variations These changes are very very small and
cannot be seen in one or two generations So it is a slow process
and generation of variation occurs after a long time

"While DNA-copying mechanisms are not absolutely accurate, they are precise enough to make the generation of variation a fairly slow process." What exactly does this line mean? Why does the generation of variation need to be a slow process? Please help.