no
with sissors
Umbilical cords have two arteries and a vein inside them. These are surrounded by a material called Wharton's Jelly and a protective membrane known as the amnion.
Embryonic stem cells come from umbilical cords in small quantities, which are harvested by collecting cord blood.
They are placental mammals.
No
Two umbilical cords, two placentas, two bags of water, two of everything! That is unless they are conjoined twins.
They get nutrients through their umbilical cords.
Male adults doesn't have umbilical cords. They are cut off from the placenta when they are born.
Not very long. Probably about one or two inches. All I know is cat umbilical cords look like tissue.
If you would like to learn some more facts about umbilical cords a great place to check is the Brewer Diet. I highly recommend it as it has come in handy many times.
No they let it hang free