In sexually reproducing animals,the union of male and female gametes forms a cell which is called:

If fertilization does not occur,the corpus luteum...

Fertilizin is secreted by which of the following?

The fertilizin chemical is present in

In teleosts,reptiles,and birds,the cleavage pattern is:

During human fertilization, which of the following induces changes and acts as a barrier to ensure that only one sperm can enter and fertilize the ovum?