When a baby is born, the first exposure to microbiota is through all of the following EXCEPT a. the baby acquires the residential microbiota in the colon after the first meal   b. Microbes enter the nose and mouth when the baby is in the birth canal   c. Staphylococcus epidermidis is transferred from the hospital staff to the newborn after delivery   d. Microorganisms grow in the respiratory tract after the baby's first breath   e. Microbes cross the placenta during pregnancy

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