Simplify the following text for a Grade 11 native English-speaking person.
Original: In the viviparous animals ( which include humans and all other placental mammals ) , the ovum is fertilized inside the female body , and the embryo then develops inside the uterus , receiving nutrition directly from the mother .
Simplified: The ovum is fertilized inside the female body , and the embryo then develops inside the uterus , being fed by the mothers placenta .