Q:

As the primitive atrium is divided into right and left atria:

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As the primitive atrium is divided into right and left atria:


  1. septum primum fuses with the endocardial cushions
  2. septum secundum fuses with the endocardial cushions
  3. both A and B
  4. neither A nor B

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A. septum primum fuses with the endocardial cushions

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