_ is a muscular partition separating the abdominal and thoracic cavities.
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Answer:
diaphragm
Explanation:
Diaphragm, dome-shaped, muscular and membranous structure that separates the thoracic (chest) and abdominal cavities in mammals; it is the principal muscle of respiration
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Diaphragm is a muscular partition seprating the abdominal and thoracic cavities.
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