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olganol [36]
2 years ago
10

View Available Hint(s) Which statement regarding normal microbiota of the human respiratory system is FALSE? The upper respirato

ry 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
Biology
1 answer:
RoseWind [281]2 years ago
5 0

Answer:

the second one

Explanation:

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4. What are tandem repeats?
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When two objects are near each other, how would increasing one object’s mass affect it?
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Most fertilizers contain ammonia. Ammonia (NH3) forms when hydrogen reacts with nitrogen. Which balanced equation represents amm
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6 0
2 years ago
Why might radar installations present a hazard to human health? Give two examples.
serious [3.7K]

Answer:

The correct answer is "two examples of how radar installations might cause hazard to human health are: decreased ability to perform mental tasks and induction of eye cataracts".

Explanation:

According to the World Health Organization electromagnetic fields below 10 Gigahertz of power do not represent a threat to human health, which make most radar installations safe for operation. However, some studies performed in primates by the exposure of increasing levels of electromagnetic fields have shown that they can developed a decreased ability to perform mental tasks and induction of eye cataracts. This is explained by the exposure of electromagnetic fields that can increase the animals' body temperature by one centigrade.

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