From the mother's body, - they are inside it while they are embryos.
If the animal comes from an egg it will get its nutrients from the yolk. If it is a mammal it will get it from the umbilical cord.
You did. Your backbone formed on the notochord. There are some fish, the lamprey, I think, that retain a notochord, These animals are chordates but not vertebrates.
Marsupial mammals retain their embryos for only a short period in the uterus
because they're a mammal and need fur since their warm blooded (need warmth in order to live)
vagina
If a mammal has a dense coat of fur, it likely inhabits a colder climate. The thick fur serves as insulation, helping to retain body heat in frigid temperatures and protect against harsh weather conditions. This adaptation suggests that the mammal is well-suited to environments where warmth is essential for survival.
dormancy
They have none this cause occurs because an elephant is a living, mammal which means their embryos cannot separate as the female can die of having two twins in the reproductive system which are consequently attached.
The One with the Embryos was created on 1998-01-15.
All chordates embryos have pharngeal slits.
The early embryos of all animals have a very similar appearance. This is no different for chicken and pig embryos.
what is the source of nourishment for developing fish embryos?