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The calm, shallow waters of coastal estuaries are easily polluted by

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The calm, shallow waters of coastal estuaries are easily polluted by [#permalink]

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New post 17 Oct 2017, 23:46
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The calm, shallow waters of coastal estuaries are easily polluted by nutrient-rich sewage. When estuary waters become overnutrified as a result, algae proliferate. The abundant algae, in turn, sometimes provide a rich food source for microorganisms that are toxic to fish, thereby killing most of the fish in the estuary.

Which one of the following can be properly inferred from the information above?

(A) Fish in an estuary that has been polluted by sewage are generally more likely to die from pollution than are fish in an estuary that has been polluted in some other way.
(B) In estuary waters that contain abundant algae, microorganisms that are toxic to fish reproduce more quickly than other types of microorganisms.
(C) Nutrients and other components of sewage do not harm fish in coastal estuaries in any way other than through the resulting proliferation of toxic microorganisms.
(D) Algae will not proliferate in coastal estuaries that are not polluted by nutrient-rich sewage.
(E) Overnutrifying estuary waters by sewage can result in the death of most of the fish in the estuary.

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[Reveal] Spoiler: OA

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Re: The calm, shallow waters of coastal estuaries are easily polluted by [#permalink]

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New post 18 Oct 2017, 18:34
Masshole wrote:
The calm, shallow waters of coastal estuaries are easily polluted by nutrient-rich sewage. When estuary waters become overnutrified as a result, algae proliferate. The abundant algae, in turn, sometimes provide a rich food source for microorganisms that are toxic to fish, thereby killing most of the fish in the estuary.

Which one of the following can be properly inferred from the information above?


The argument:
nutrient-rich sewage pollute estuaries => algae proliferate => sometimes microorganisms proliferate => kill most of the fish in the estuary.

(A) Fish in an estuary that has been polluted by sewage are generally more likely to die from pollution than are fish in an estuary that has been polluted in some other way.
The argument makes no comparison between fish polluted by sewage and fish polluted by other way

(B) In estuary waters that contain abundant algae, microorganisms that are toxic to fish reproduce more quickly than other types of microorganisms.
The argument doesn't provide any information indicated that microorganisms reproduce more quickly than other types of microorganisms.

(C) Nutrients and other components of sewage do not harm fish in coastal estuaries in any way other than through the resulting proliferation of toxic microorganisms.
The argument doesn't indicate that toxic microorganisms are the only reason to kill the fish. Toxic microorganisms are just a possible reason.

(D) Algae will not proliferate in coastal estuaries that are not polluted by nutrient-rich sewage.
The argument provides no information indicated that algae will only proliferate in coastal estuaries that are polluted by nutrient-rich sewage.

(E) Overnutrifying estuary waters by sewage can result in the death of most of the fish in the estuary.
Correct. This choice just restates the final sentence.
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Re: The calm, shallow waters of coastal estuaries are easily polluted by   [#permalink] 18 Oct 2017, 18:34
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The calm, shallow waters of coastal estuaries are easily polluted by

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