Which one of the following parts serves the function of primary organizer in frog

In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was

Implantation or uterine attachment of the blastocyst presumably occurs between

Given below is a diagrammatic sketch of a portion of human male reproductive system. Which of the following part contributes to the maximum portion of semen?

During embryonic development the establishment of polarity along anterior / posterior, dorsa l/ ventral or medial / lateral axis is called