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.
No they hatch from eggs
no
Embryonic stem cells come from umbilical cords in small quantities, which are harvested by collecting cord blood.
Yes, they do. When they are born, the momma cat chews through the umbilical cord, and the sack that each kitten is in.
No
They are placental mammals.
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.
A baby's umbilical cord is kept inside a cord bank because it is the only effective procedure to preserve stem cells, which cure irreversible diseases such as cerebral diseases, brain tumor, cancers, diabetes, Parkinsons, etc.
the chickens that i have dont. When a chick grows in an egg it does have an umbilical cord connecting it to the yolk to give it nourishment while it grows. Once the chick hatches it will come off in a day or two. I am not sure if the umbilical cord is there even if an egg isn't fertilized but I would guess that is what those white stringy things in our eggs are?
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.