Infants and small children are referred to as "belly breathers" because:
A. the skin covering the abdomen is thicker than the chest wall.
B. the diaphragm is less developed than the intercostal muscles.
C. their intercostal muscles are weak and not well developed.
D. gastric distention interferes with diaphragmatic movement.
Answer: C. their intercostal muscles are weak and not well developed.
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