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
with sissors
Embryonic stem cells come from umbilical cords in small quantities, which are harvested by collecting cord blood.
They are placental mammals.
No
Yes, they do. When they are born, the momma cat chews through the umbilical cord, and the sack that each kitten is in.
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.
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.
Not very long. Probably about one or two inches. All I know is cat umbilical cords look like tissue.