During spermatogenesis, which of the following undergoes meiosis ii to produce four haploid mature sperm cells? a. haploid primary spermatocyte b. diploid secondary spermatocyte c. secondary spermatocytes

The correct option is C- Secondary spermatocytes

The secondary spermatocytes go under meiosis II to produce four haploid mature sperm cells. The spermatogonial stem cells divide from primary spermatocytes by mitosis.  Then undergoing the meiosis II, the primary spermatocyte enters diploid stage. Daughter cells are formed after first meiotic division. These daughter cells or secondary spermatocytes go through another meiotic division that in turns gives rise to the haploid spermatids.

it would lead to upper respiratory infections and pneumonia.

the fossil record provides evidence of a common ancestor to many species.