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One Question A day Reading Comprehesion Q#3 27022014

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One Question A day Reading Comprehesion Q#3 27022014 [#permalink] New post 01 Mar 2014, 21:55
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One Question A day Reading Comprehesion Q#3 27022014

The levels of dissolved oxygen in the world’s ocean waters are declining precipitously. Just like humans, fish need oxygen to survive, and so in ocean areas experiencing significant levels of oxygen scarcity, or hypoxia, fish populations are plummeting. Although some hypoxic areas, called “dead zones,” occur naturally, hypoxia in coastal areas and inland waters is caused mainly by agricultural run-off and by discharge of industrial waste waters. More than one-hundred permanent dead zones, many covering thousands of square miles, exist worldwide today.
Since reproductive success is the most critical factor in the sustainability of any species, the extent of this threat to marine lifeand genetic diversity can hardly be overstated. After several months in hypoxic waters, female fish produce fewer eggs. Moreover, hypoxic conditions serve to alter the normal ratio between two particular hormones manufactured during the embryonic stage when a fish’s gender is determined. During gestation and under these conditions, the mother produces more testosterone (and less estradiol), which inhibits the development of female reproductive organs and other female characteristics in the embryo, while promoting the development of male traits. Source: based on GMAT Pill


Question

The passage explicitly supports the assertion that hypoxia

(A) drives salt-water fish away from coastal waters
(B) occurs mainly in inland waters
(C) poses a threat to the coastal fishing industry
(D) is the result of lax environmental regulation
(E) oxygen-depleted areas occur due to impact man=made causes



Answer and Analysis

[Reveal] Spoiler:
The correct response is (C). In the second paragraph the author states that "the extent of this threat to marine life and genetic diversity can hardly be overstated," suggesting that in the author's view hypoxia has reached critical, or alarming, levels.

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One Question A day Reading Comprehesion Q#3 27022014   [#permalink] 01 Mar 2014, 21:55
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One Question A day Reading Comprehesion Q#3 27022014

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