Answer
The first yolk sac encloses the entire yolk body and is formed in the 5-day embryo.
The mesoderm and ectoderm term layers extend beyond the embryo to make the chorion and the amnion, which form the amniotic cavity.
The chorion and the allantoic membrane regulate gas exchange between the embryo and its environment.
The allantois stores the waste products from the embryo.
Work Step by Step
The first yolk sac encloses the entire yolk body and is formed in the 5-day embryo.
The mesoderm and ectoderm term layers extend beyond the embryo to make the chorion and the amnion, which form the amniotic cavity.
The chorion and the allantoic membrane regulate gas exchange between the embryo and its environment.
The allantois stores the waste products from the embryo.
