The cells formed as a result of cleavage are called:

What is true about cells during cleavage?

Observe the diagram of an ovum surrounded by a few sperms:
Which of the following options is correct for the labelled parts $A, B$ and $C$?
$A$ $\quad$ $B$ $\quad$ $C$

Corpus luteum secretes.....

Which hormone helps in the journey of sperms towards the ampulla by causing contractions of the uterus and fallopian tube?

Which reproductive adaptation is characteristic of most terrestrial vertebrates but not of most aquatic vertebrates?