Assertion : In placental mammals the placenta   is connected  to the embryo by the umblical cord and
Channel: Doubtnut
Date: 24/05/2020

Assertion : In placental mammals the placenta   is connected  to the embryo by the umblical cord and has an essential role in the immunological protection of the embryo .  Reason : In mammals foetal components of the placenta derive initially  from the chondroblast connected with embryonic derive  initially from he chondroblast connected  with embryonic  blood stream either through its contact with the yolk sac.