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@delvey
Throughout the pregnancy, some of the cells migrate—individually or in groups—from certain areas of the embryo to other areas. Other cells group together and form sheets or fold over into cords or cavities. These processes require remarkable coordination. For example, at one point, sheets of cells curl themselves into little tubes. This happens simultaneously in various places throughout the embryo. The tubes then begin to lengthen and branch out, eventually joining to produce a complete circulatory network. By the time a healthy baby is born, its hundreds of billions of cells have all specialized into the correct type, in the correct location, and at the correct time. What do you think? Did the cell’s ability to specialize evolve? Or was it designed?
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