Which of the following is not a characteristic of the amniotic sac?

keeps the embryo from drying out

maintains a constant temperature

cushions and protects the embryo

feeds the embryo

I think the correct answer from the choices listed above is the last option. It would be to feed the embryo would be not a characteristic of the amniotic sac. The embryo is when the Zygote is developed into a blastula. Hope this answers the question. Hope this answers the question.