A butterfly only has 6 legs, but caterpillar has many. Are those 6 legs connected to each leg of a caterpillar? How does a butterfly control the legs of a caterpillar when it's crawling?
I understand that organ function varies with the stages of development. Does a fetal liver EVER perform lipogenesis, gluconeogenesis, make bile, etc? Or does it only begin performing these actions ...
The mammalian blastocoel becomes yolk sac without yolk according to my professor. I have not found any evidence that such a thing happens in amphibians like frog. I need to be able to compare and ...