Which of the following differentiates spermatogenesis and oogenesis?
I. Meiosis proceeds continually without pausing in spermatogenesis, while oogenesis involves a meiotic pause.
II. Spermatogenesis only occurs during puberty.
III. Spermatogenesis produces four haploid sperm cells from each diploid precursor cell, while oogenesis produces one egg cell and two or more polar bodies.