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The placenta.
Monkeys have a gestational period of 140-150 days. During ths time, the embryo develops and recieves nutriants from the mother.
She remains pregnant as the embryo develops in her uterus.
Ther is no such thing as period of embryo .
Accelerate embryo growth
The gestation period (about 266 days in humans) is when the embryo is developing inside the womb.
Gestation is when an embryo is inside the womb of female animal. The gestation period is the female's pregnancy, from conception to birth.
The embryo will develop into a foetus in the womb.
Fetus
The common term is pregnancy. The technical term is gestation.
The organs mature.
If it's a human embryo, about nine months. If you're a mouse embryo, about twenty days. Gestation time in mammals varies species to species, but it's generally safe to say the bigger the animal, the longer the gestation.