Final answer:
The journey of an egg begins with its formation in the ovaries during fetal development and continues through ovulation, fertilization, and pregnancy.
Step-by-step explanation:
The journey of an egg begins during fetal development in the ovaries of a female fetus. These ovaries contain thousands of eggs, or oocytes, that are in an immature state. After puberty, hormonal changes trigger the maturation of one egg each month in a process called ovulation. During this process, the mature egg is released from the ovary and travels through the fallopian tube, where fertilization can occur if sperm is present.
If the egg is fertilized by a sperm, it implants itself in the uterus and pregnancy begins. The fertilized egg, now called a zygote, divides and develops into an embryo. Over the course of approximately nine months, the embryo undergoes various stages of development, forming different organs and systems. The placenta, a vital organ during pregnancy, provides oxygen and nutrients to support the growing fetus. Finally, labor and childbirth occur, resulting in the expulsion of the fetus and placenta from the uterus.