They are placental mammals.
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
Yes, they do. When they are born, the momma cat chews through the umbilical cord, and the sack that each kitten is in.
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?
No they hatch from eggs
no
Embryonic stem cells come from umbilical cords in small quantities, which are harvested by collecting cord blood.
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.
Humans have umbilical scars because we are born viviparous with placental development, where the umbilical cord connects the fetus to the mother. Other species that are oviparous or have different modes of reproduction do not have prominent navels because they do not rely on umbilical cords for nourishment.
No
i don't think so but if they do it is very tiny tinny!
Two umbilical cords, two placentas, two bags of water, two of everything! That is unless they are conjoined twins.
No, only mammals which develop inside the mother's womb depend on a placenta for their growth, and therefore have an umbilical cord. (There is no umbilical cord involved in the development of those few mammals who lay eggs or whose babies develop in the mother's pouch.) Since birds are hatched from eggs, no placenta-umbilical cord mechanism is involved. Most of a fetal bird's development takes place outside its mother's body, in the egg.