Humans have three openings in an analogous place. Why is there a difference in the number of openings in pigs and humans?

What is a choriovitteline placenta, and in which group(s) of animals can it be found?

What structures carry the egg from the ovaries to the uterus? Are these structures the same in all the examined animal ,how do they differ ?

Examine whether the statement "Because of the many later developmental transformations that produce the elaborately structured organs, the body plan set up during gastrulation bears little resemblance to the body plan in the adult is true or false.

In frogs, yolks are plugged into the bottom of the blastopore, which develops into the anus. How about in sea urchins? I know in sea urchins the blastopore will become an anus but is there also a yolk plug, or does the bottom of the archentron simply develop into the anus?

Endodermal Derivatives of the 10 mm Pig Embryo   QUESTIONS (1) What is the double membrane separating the pharyngeal pouch and furrow? (2) What is the position of the first visceral arch in relation to the mesencephalon in your slide? (3) What is the fate of the postanal gut?

What does Singer think is more valuable, a human embryo or the life of an ape? How does he justify his point of view? (max. 150 words)

In a female fetal pig, what is the urogenital sinus?  Next, explain what changes take place with this structure as the fetus develops into an adult, describing how the exits for the excretory and reproductive systems change.

Name a gene that will disrupt somitogenesis and  describe its effects on formation of the axial skeleton?