Prenatal development occurs in three distinct periods. The _…
Prenatal development occurs in three distinct periods. The __________ period lasts from conception to about two weeks, during which the fertilized egg undergoes rapid cell division and implantation in the uterus. The __________ period spans from the third week to the end of the eighth week, during which major organs and body systems begin to form. The __________ period extends from the ninth week until birth, characterized by significant growth and maturation of the developing fetus.
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