The third cleavage of frog development is:

The jelly layer of a frog's egg is:

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

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

In the development of a frog, the gastrulation process involves:

If the ectoderm from the neural tissue area is removed from the embryo and transplanted in place of the presumptive belly ectoderm,the embryo will develop: