At approximately what time during intrauterine development does the initial thickening of the oral ectoderm, indicating the future deciduous teeth, occur?

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On the 25th day of fetal developmentAround the 34th day of gestationNear the 56th day of intrauterine lifeAt 20 weeks of prenatal development

Explanation

The earliest indication of future deciduous teeth is seen as a thickening of the oral ectoderm, which typically appears around the 56th day of intrauterine life, marking the beginning of tooth development.