The figure given below illustrates the changes taking place during the human menstruation cycle

Identify hormones $A, B, C, D$ and $E$ from the figures

In the boxes shown in the figure write the name of the hormone (or hormones) controlling the stage in the human menstrual cycle

In vertebrates the nails are formed from

Which of the following structure is found in blastula

The amniotic fluid is taken out with the help of surgical needle and separation of the embryo cells present in this fluid is done by

In determinate cleavage, the spindle is