4 The human body is About 70% water 5. Fluoridation is part of the hydrologic cy

Question

4 The human body is About 70% water 5. Fluoridation is part of the hydrologic cycle 6. Mottled teeth results from drinking water with chlorine Legionella bacteria usually found in water from cooling towers 8. Smog is a mixture of air pollutants Amebiasis is caused by a virus 9. High levels of air pollutants can endanger health 10. Cigarette smoke is a suspected carcinogen 11. Older adults are less susceptible to exposure to pollutants 7. 12. Volcanic dusts often contain silica 13. Buses and trucks produce more pollutants than motor cars

Explanation / Answer

4.true, the normal human body is 65-70 percentage of water

5.false, it is controlled addition of fluoride to public water supply so that tooth decay can be reduced

6.false, it results with drinking water with fluorine

7.true, they are found in cooling towers

We are instructed to answer only first 4 questions in cases of this type

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