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

What gives rise to an adult individual?

The embryo at the $16$-celled stage is called:

Which lytic enzyme present in the sperm helps in penetrating the corona radiata during fertilization?

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?

Statement-$I$: The trophoblast layer gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.
Statement-$II$: The morula becomes embedded in the endometrium of the uterus.