No they hatch from eggs
no
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.
Monkeys typically chew or tear their umbilical cords after giving birth. This behavior is instinctual and helps the mother monkey detach the newborn safely from the placenta.
Male adults doesn't have umbilical cords. They are cut off from the placenta when they are born.
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
Not only humans have umbilical cord, all the mammals of the Eutheria infraclass have it, this are the placental mammals and are all the animals that give birth to a live animal but not including the marsupials such as the kangaroo, for example the human, the dog, the cow all have umbilical cord