Several hormones like $hCG, hPL$, estrogen, progesterone are produced by

Which one of the following statements with regard to embryonic development in humans is correct?

All of the following statements concerning pregnancy are accurate $EXCEPT$

During the course of development, cells in various regions of embryo become variable in morphology and eventually perform diverse functions. This process is known as

Which of the following organ is differentiated first during development ?

During pregnancy the level of which hormones are increased ?