Yes
placenta
Embryo gets its food via placenta .
The yolk supplies all the nutrients for the growing embryo.
Embryo's have gills to breathe inside placenta.
No. In a female, the placenta provides the nutrients and essential counterparts to support the growing fetus.
That depends on what animal because baby chickens feed on the yolk inside the egg while a human embryos get food and oxygen from their mother's umbilical cord.
An embryo
The embryo attaches to the placenta when it reaches the uterus very early in a pregnancy.
Placenta
placenta
PLACENTA
It nourishes the embryo