Question

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the abdominal and thoracic walls are drained by tributaries of two major veins: the vein and the vein.
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Explanation:

In human anatomy, the abdominal and thoracic walls are drained by tributaries of the superior vena cava and inferior vena cava. These two major veins play crucial roles in returning de - oxygenated blood to the heart.

Answer:

superior vena cava; inferior vena cava