In middle childhood the tube in the inner ear that is often the site of ear infections in toddlerhood and early childhood matures and is longer and narrower than it was before. How does this make ear infections less likely?
A. The tympanic membrane becomes less permeable.
B. It allows the immune system to concentrate its efforts on this area.
C. Children develop immunity to the bacteria that cause ear infections during this time.
D. Less bacteria-containing fluid flows from the mouth to the ear.
Answer: D
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