Biology / Bio 3349 · Atom · ~20 seconds
Human Gestation: a Structural Mechanism
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Human gestation proceeds through stages in which the fertilized egg implants in the uterine wall, per Bio 3331, then builds organ systems this unit traces later.
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Implantation must occur within about a week of fertilization or the embryo fails to connect.
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This entry names a developmental-timeline mechanism only —