Final answer:
Meiosis cell division brings variation through mechanisms like crossing over and random assortment of chromosomes, which create unique combinations of genes and ensure genetic diversity in offspring.
Step-by-step explanation:
Meiosis cell division brings variation because it introduces different mechanisms that generate genetic variation among the products of meiosis. One mechanism is crossing over during prophase I, where homologous chromosomes exchange segments.
This reshuffling of genetic information leads to unique combinations of genes in offspring. Another mechanism is the random assortment of homologous chromosomes at the metaphase plate during meiosis I. The different possible arrangements of chromosomes create a high number of genetically distinct gametes. Together, these mechanisms ensure that offspring produced through meiosis have unique genetic compositions, contributing to genetic diversity in populations.