<h3>Each secondary spermatocyte completes the second meiotic division without the replication of DNA and produces 2 spermatids each containing 23 chromosomes. Spermatids undergo morphologic alteration (spermiogenesis) to become mature spermatozoa.</h3>
Gravity pulled it to the center of the Earth.
Answer: Archaebacteria, Eubacteria, Protista, Fungi, Plantae and Animalia.
