The embryo develops in the uterus, which is a pear-shaped organ located in a woman's pelvic cavity.

Here's a breakdown of the process:

1. Fertilization: A sperm cell fertilizes an egg cell in the fallopian tube.

2. Implantation: The fertilized egg, now called a zygote, travels down the fallopian tube and implants itself in the lining of the uterus.

3. Development: The embryo grows and develops inside the uterus, receiving nourishment and oxygen through the placenta, which connects the embryo to the mother's bloodstream.

Let me know if you have any other questions about the development of the embryo!