Health

Health, 01.10.2019 09:30, alkaline27

Water is treated to replace harmful chemicals, and bacteria so people can then drink it. true or false.

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Biology, 25.07.2019 20:30, yhhh

After the oil spill in the gulf of mexico, one of the treatments included the addition of harmless, oil-eating bacteria. how could this be better than more traditional methods of cleaning up oil spills? a. when the bacteria finally die, it removes needed oxygen from the water. b. the addition of other harmful chemicals may be needed to speed up the process. c. the use of the bacteria, alone, could take years to completely remove the oil. d. the bacteria can break down harmful substances into simpler, less toxic substances.

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Chemistry, 21.08.2019 01:00, faithrawlins14

Mercury is environmental pollutant that is produced by the burning of fossil fuels and can be toxic to wildlife and humans. what does this show about the impact of chemicals on the environmental? a. the beneficial effects people get from chemicals may have unintended harmful effects on the environment. b. people cannot control the negative effects of chemicals on the environment. c. the harm chemicals could have on the environment outweighs the benefits that people get from the chemicals. d. all chemicals that people introduce into the environment are harmful.

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Chemistry, 10.10.2019 03:40, nrudd9799

True or false? monera is the name of a biological kingdom. some bacteria are harmful. bacteria are usually very large organisms. bacteria cannot live in water. bacteria can us digest our food.

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Chemistry, 18.10.2019 09:30, Almonte87

1. what is hypoxia? a. reduction in water levels b. depletion of oxygen c. having excess sediment in the water d. a form of run off 2. what are the main pollutants that contribute to hypoxia in water? a. organic chemicals b. infectious agents c. plant nutrients d. metals 3. in the gulf of mexico hypoxia results from agricultural chemicals used in various us states. true or false? 4. why is a hypoxic zone sometimes called a dead zone? a. fish and other water organisms cannot live without sufficient oxygen b. people cannot swim in the water c. algae will not grow in the water d. the water contains many bacteria and viruses 5. hypoxia in the gulf of mexico is an example of point source pollution. true or false? 6. how do wetlands control hypoxia? a. contribute nutrients to the water b. contribute sediment to the water c. speed up the flow of water d. filter nitrogen and phosphorus from the water 7. controlling sewage water can control hypoxia. true or false?

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