What breathes by relaxing the lungs?\nOptions:\n- (A) mammals\n- (B) tortoises\n- (C) dogs\n- (D) chickens\n- (E) ducks\n- (F) humans\n- (G) crocodiles\n- (H) animals Let's be accurate as possible.
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Mammals breathe with the help of a diaphragm. Belly breathing uses the diaphragm, which helps relax the lungs. Mammals breathe by relaxing the lungs.
The final answer: (A).
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