Mesoderm gives rise to all the structures except

What does the corpus luteum secrete?

After gastrulation,the roof of the archenteron is formed by:

The three germ layers—ectoderm,endoderm,and mesoderm—are formed by the division of the embryo. Identify the error in the given statement regarding the process of organogenesis mediated by stem cells.

Human embryo is a solid ball of $16-32$ cells by the end of . . . . . . day after fertilization.

Select the correct option describing gonadotropin activity in a normal pregnant female: