Based on the standard comparison of these processes in the textbook:

1. Initiation: Spermatogenesis starts at the age of puberty , whereas oogenesis is initiated during the embryonic development stage . (Likely Statement e)
2. Differentiation: Spermatids undergo a specific process of differentiation called spermiogenesis to become spermatozoa . Oogenesis generally lacks a post-meiotic differentiation phase of this magnitude.
3. Continuous Division: Spermatogonia multiply by mitotic division and increase in numbers continuously , while no more oogonia are formed or added after birth .