In placental mammals, the branching extension of the chorion that projects into the maternal tissues at the placenta is the Blank______.Multiple choice question.allantoischorionic villusamnionembryonic diskmesodermNeed help? Review the

The extraembryonic membrane that contributes blood vessels for the formation of the umbilical cord in mammals is the Blank______.Multiple choice question.allantoischorionamnionyolk sac

Multiple Choice QuestionThe extraembryonic membrane that is the first site of blood cell formation in mammals is the Blank______.Multiple choice question.allantoisyolk sacamnionchorion

By about week ten of human embryonic development, the chorion has developed into the Blank______, which secretes hormones that help maintain the pregnancy.Multiple choice question.amnionplacentaallantois

A mammalian egg undergoes Blank______ cleavage, forming a structure called a Blank______.Multiple choice question.meroblastic; blastocystmeroblastic; blastodischoloblastic; blastocystholoblastic; blastodisc

The extraembryonic membrane that contains fluid to cushion and protect the embryo is the Blank______.Multiple choice question.yolk sacallantoisamnionchorion