Which type of placenta is present in the early human embryo?

Which of the following statements is true regarding cleavage?

The structural and functional unit formed between the embryo and the maternal body is called .......

In which order do the three germ layers appear during embryonic development?

Foetal ejection reflex in human female is induced by

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 . . . . . . .