_ is the most critical phase of mitosis.

Explanation

The most critical phase of mitosis is anaphase.It is the most critical phase of the mitosis, which ensures equal distribution of chromatids in the daughter cells. The kinetochore fibers of spindle contract towards their respective poles, at the same time polar microtubules elongates exert force and sister chromatids are separated from centromere. As a result, half sister chromatids travel towards each pole. By precisely distributing chromosomes, anaphase guarantees that the two daughter cells formed at the end of mitosis are genetically identical to the parent cell. In essence, the orderly separation of chromosomes during anaphase is fundamental to the successful and accurate completion of mitosis, which is essential for growth, tissue repair, and overall organismal health.