Final answer:
The label that belongs in the region marked Z in the Venn diagram comparing mitosis and meiosis is Forms haploid cells.
Step-by-step explanation:
The label that belongs in the region marked Z in the Venn diagram comparing mitosis and meiosis is Forms haploid cells.
Meiosis is the nuclear division that forms haploid cells from diploid cells. Unlike mitosis, which produces genetically identical diploid daughter cells, meiosis results in haploid daughter cells that have half the number of chromosomes as the parent cell. This reduction in chromosome number is achieved through two rounds of nuclear division during meiosis. Therefore, the correct label for region Z is Forms haploid cells.