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d) all of these are correct.
Meiosis I involves the pairing of homologous chromosomes and crossing over, which does not occur in meiosis II. At the end of meiosis I, the resulting cells have half the amount of DNA as the original cell, while at the end of meiosis II, the amount of DNA remains the same. Additionally, during meiosis I, chromosomes line up in pairs at the equator of the cell, while during meiosis II, the sister chromatids line up individually.