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In mammals the powerful muscle that aids in breathing is the A. diaphragm. B. kidney. C. cerebrum. D. placenta.

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The diaphragm is the powerful muscle that aids in breathing.

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User Llewlyn
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In mammals, the powerful muscle that aids in breathing is the diaphragm. This muscle expands and contracts the chest cavity and forces air in and out of the lungs.
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User Fouad Boukredine
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