Question

which of the following layers of the common amniotic egg laying ancestor of both reptiles and mammals is not used and repurposed during human pregnancy? amnion chorion yolk allantois none of the above 20 multiple choice 5 points what must dilate for a baby to be born? fallopian tubules uterus cervix ovarian follicles

Explanation:

• For the first question:
• The amnion forms the amniotic sac which surrounds the fetus.
• The chorion contributes to the placenta.
• The allantois contributes to the umbilical cord.
• Humans do not have a yolk - containing structure as the embryo gets nutrients from the placenta.
• For the second question:
• The cervix is the lower part of the uterus. During childbirth, it must dilate (open up) to allow the baby to pass through the birth canal.
• Fallopian tubules are for transporting the egg.
• The uterus contracts but does not dilate in the sense required for birth passage like the cervix.
• Ovarian follicles are related to egg development.

Answer:

• First question: C. Yolk
• Second question: C. Cervix