The function of the allantois in mammals is:

The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. The embryo's heart is formed after one month of pregnancy. Which of the following gestation periods is correctly matched?

Which structure differentiates the gastrula from the blastula?

Amnion helps in

Following changes can be seen in the first trimester of pregnancy,$EXCEPT$:

The villi which are formed by the allantochorion to form an intimate connection with the uterine endometrium function as: