Zoology Answers

I was reading O’Donnell, Liza et al. “Spermiation: The Process of Sperm Release.” and got stuck with a question.

From the paper,'' Spermiation is the process by which mature spermatids are released from Sertoli cells into the seminiferous tubule lumen prior to their passage to the epididymis.''

When did the spermatids got attached/associated to Sertoli cells that during spermiation they were released from the sertoli cells?

What are rostral barbels?

Are they the barbels found on rostrum, the nasal part of fishes?

constipation is related to which field of biology ...? say for e.g. is it a cell biology or developmental biology

In which book can I find classification with CHARACTERS of Pisces by Romer(1959)?

According to ncert organ level of organisation start from platyhelminthes
But its flate
but my confusion organ system level of organisation should start from aschelminthes
Bcoz its roundworm tht means its having complet alimenty canal
so whats correct answer?

Why do small family groups have less of a need for communication systems than larger ones?

Hello Experts

Problem- What is IMPLANTATION AND GASTRULATION.{in context to embryonic development of humans} I am having difficulty in understanding the concept of it. PLEASE EXPLAIN THE TERMS IN greater depths and DETAIL.I shall be highly obliged