The vegetal hemisphere of an egg consists of:

The correct sequence in the embryonic development of a frog is:

During the development of an amphibian embryo,what is the significance of the point of entry of the sperm into the egg at fertilization?

The fifth cleavage of the fertilized egg of a frog results in the formation of: (in $cells$)

Which of the following is a good example of metamorphosis?

At what stage is the primitive streak in the chick embryo formed?