What is the job of the amniotic sac?

All amniotes

Testis is attached to the scrotal sac by

What are the 'Golden ages' of the first jawed vertebrates and the first amniotes ?

A foetal sex determination test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo is called

Where is the egg apparatus is placed in the embryo sac ?

Which one is the female gamete in embryo sac?

"Air leaves the tiny sacs in the lungs to pass into capillaries." What modification is needed in the statement ?

Out of 13 applicants for a job, there are 5 women and 8 men. It is desired to select 2 persons for the job. The probability that atleast one of the selected persons will be a woman is

At the age of 280 days in the embryo the testes descend permanantly into the scrotal sacs through