Q:

During the fug week of human development:

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During the fug week of human development:


  1. the zona pellucida is fonned
  2. the cells of the embryo increase in number but become smaller
  3. the cells of the embryo increase in size
  4. implantation is completed
  5. none of the above (A-D)

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B. the cells of the embryo increase in number but become smaller

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