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        6-12

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        Auditory, Visual

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        Cell Differentiation

        How does a single fertilized egg grow to become a fully formed human being? Many of the most critical stages happen in the first few days following conception. In this video segment from The Secret of Life, a fertilized egg cell progresses from its earliest stages through cell differentiation and ultimately the development of an embryo, with simple but identifiable body parts including a spinal cord, a heart, and eyes.

        This video is available in both English and Spanish audio, along with corresponding closed captions. 

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