Final answer:
Human development starts with fertilization and progresses through different stages until birth. Pregnancy involves significant changes in a woman's body to support the growth and development of the fetus.
Step-by-step explanation:
Human Development from Fertilization to Birth
Human development begins with fertilization, where a sperm fertilizes an egg to form a zygote. The zygote then undergoes a series of divisions to form an embryo, which implants itself into the uterine wall. Over the course of approximately nine months, the embryo develops into a fetus, which undergoes rapid growth and major changes in various organ systems. Finally, after completing the full term of pregnancy, the fetus is ready for birth.
Major Changes During Pregnancy
Pregnancy is a time of significant physiological and anatomical changes in a woman's body. Some major changes include the enlargement of the uterus to accommodate the growing fetus, increased blood volume to supply oxygen and nutrients, hormonal changes to support pregnancy, and changes in the breasts to prepare for lactation. Additionally, the placenta develops to provide a connection between the mother and the fetus, allowing the exchange of nutrients and waste products.
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