题目内容

In a river ecosystem, dissolved oxgyen concentrations drop quickly downstream from a point source input of organic matter into the river. This effect is due to

A. increasing populations of mayfly and stonefly larvae.
B. increasing activity of trout and sea bass.
C. increasing bacterial activity as organic matter decays.
D. decreasing bacterial activity as turbidity increases.
E. decreasing water temperature as surface evaporation increases.

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Which of the following is/are true of using freshwater aquifers for potable and irrigation water in an arid region? I. slow recharge of the aquiferII. aquifer pollutants not naturally cleansedIII.eutrophication

A. I only
B. II only
C. I and II only
D. I and III only
E. I, II, and III

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Questions 5 - 7Which of the following is an appropriate remediation strategy for removing radon gas from the home?

A. Use filtered water for drinking and bathtime.
B. Do not occupy the basement of the home.
C. Place mmonitors in suspect areas of the home.
D. Remove and replace soil in crawl spaces under the home.
E. Seal or ventilate places where radon enters the living space.

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This source can harm migratory birds. ______

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Water and electricity are the products of this source. ______

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In a river ecosystem, dissolved oxgyen concentrations drop quickly downstream from a point source input of organic matter into the river. This effect is due to

A. increasing populations of mayfly and stonefly larvae. B. increasing activity of trout and sea bass. C. increasing bacterial activity as organic matter decays. D. decreasing bacterial activity as turbidity increases. E. decreasing water temperature as surface evaporation increases.

Which of the following is/are true of using freshwater aquifers for potable and irrigation water in an arid region? I. slow recharge of the aquiferII. aquifer pollutants not naturally cleansedIII.eutrophication

Questions 5 - 7Which of the following is an appropriate remediation strategy for removing radon gas from the home?

This source can harm migratory birds. ______

Water and electricity are the products of this source. ______

A. increasing populations of mayfly and stonefly larvae.
B. increasing activity of trout and sea bass.
C. increasing bacterial activity as organic matter decays.
D. decreasing bacterial activity as turbidity increases.
E. decreasing water temperature as surface evaporation increases.