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The development of a fertilized egg in humans takes place in the uterus. Here are the steps:

1. Fertilization: This is the process where an egg from the ovary and sperm from the testis meet in the fallopian tube (also known as the oviduct). The sperm penetrates the egg, creating a fertilized egg, or zygote.

2. Cell Division: The zygote begins to divide into multiple cells, forming a small ball of cells called a morula.

3. Blastocyst Formation: As the morula continues to divide, it becomes a blastocyst. The blastocyst has an inner group of cells with an outer shell.

4. Implantation: The blastocyst reaches the uterus about 5-6 days after fertilization. It embeds itself into the uterine wall, where it continues to grow and develop into an embryo.

5. Embryo Development: The implanted blastocyst develops into an embryo. The embryo will continue to grow and develop into a fetus.

6. Birth: After about nine months of development, the fully formed baby is born.