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View Available Hint(s) Which statement regarding normal microbiota of the human respiratory system is FALSE? The upper respiratory tract is mostly sterile. The ciliary escalator in the bronchial tubes keeps the lower respiratory tract nearly sterile. Potentially pathogenic microorganisms are present in nonsterile portions of the respiratory tract but usually do not cause disease. The trachea normally may contain a few bacteria. Provide Feedback
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View Available Hint(s) Which statement regarding normal microbiota of the human respiratory system i...
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