The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. Embryo's heart is formed _________.

Animal $\quad$ Gestation period

The amniotic fluid is taken out with the help of surgical needle and separation of the embryo cells present in this fluid is done by

Location – function : Spermatid and Hyleuronidase

Which of the following layers in an antral follicle is acellular?

The mammary glands are paired structures that contain the glandular tissue and variable amount of fat. The correct sequence of tissues involved in synthesis and flow of milk are