Zoology or Animal Biology
Is trophoblastic nutrition preembryonic stage of development?
No, it is part of the embryonic and fetal stages of development. After implantation, the conceptus is fed by trophoblastic nutrition. This is the dominate mode of nutrition fo
r 8 weeks.
Is trophoblast is present even as germ layer formation is occurring in human?
If your question is 'Is the trophoblast present during germ layer formation (i.e. gastrulation) ?' then the answer is YES