Physiologic pH is maintained at approximately 7.4 because bicarbonate (HCO3) and carbonic acid (H2CO3) exist in what ratio?
a. 20:1
b. 1:20
c. 10:2
d. 10:5
Answer: a. 20:1
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Which statement by a mother indicates that her 5-month-old infant is ready for solid food?
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