{"id":57567,"date":"2025-08-26T21:52:41","date_gmt":"2025-08-26T16:22:41","guid":{"rendered":"https:\/\/e-gmat.com\/blogs\/?p=57567"},"modified":"2025-09-05T00:25:24","modified_gmt":"2025-09-04T18:55:24","slug":"sea-otters-in-kedrick-bay-feed-on-sea-urchins-and-thus-keep-the-local","status":"publish","type":"post","link":"https:\/\/e-gmat.com\/blogs\/sea-otters-in-kedrick-bay-feed-on-sea-urchins-and-thus-keep-the-local\/","title":{"rendered":"Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin&#8230;.."},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">A <\/span> <span class=\"rt-time\">4<\/span> <span class=\"rt-label rt-postfix\">min read <\/span><\/span>\n<p>Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin population from growing large enough to destroy the kelp beds on which the urchins feed. Therefore, any oil spill that destroyed the sea otter population in Kedrick Bay would guarantee the destruction of the kelp beds by the urchins.<\/p>\n\n\n\n<p>Which of the following, if true, would most seriously call into question the reasoning in the argument above?<\/p>\n\n\n\n<ul><li>A. An oil spill severe enough to destroy the Kedrick Bay otter population would be likely to diminish the populations of other animal species that feed on Kedrick Bay&#8217;s sea urchins.<\/li><li>B. If the population of sea otters in Kedrick Bay declined in number as the result of an oil spill, sea otters from other locales would not soon replace them.<\/li><li>C. In locales where both sea urchins and sea otters are present, sea urchins are the sea otter&#8217;s main food source.<\/li><li>D. Because of the pattern of ocean currents in and around Kedrick Bay, there is little likelihood that even a major oil spill in the area would affect the size of the local sea otter population.<\/li><li>E. The sea urchin population in Kedrick Bay would be likely to be harmed by any oil spill that reduced the size of the local sea otter population.<\/li><\/ul>\n\n\n\n<h2 id=\"h-solution\">Solution<\/h2>\n\n\n\n<h3 id=\"h-passage-analysis\">Passage Analysis:<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Text from Passage<\/strong><\/td><td><strong>Analysis<\/strong><\/td><\/tr><tr><td><em>Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin population from growing large enough to destroy the kelp beds on which the urchins feed.<\/em><\/td><td><strong>What it says:<\/strong>&nbsp;Sea otters eat sea urchins, which prevents too many urchins from eating all the kelp<br><strong>What it does:<\/strong>&nbsp;Sets up the ecosystem balance &#8211; shows how otters control urchin numbers to protect kelp<br><strong>What it is:<\/strong>&nbsp;Author&#8217;s premise about ecosystem relationships<br><strong>Visualization:<\/strong>&nbsp;Otters (200) \u2192 eat urchins \u2192 urchin population stays manageable (1,000) \u2192 kelp beds survive<\/td><\/tr><tr><td><em>Therefore, any oil spill that destroyed the sea otter population in Kedrick Bay would guarantee the destruction of the kelp beds by the urchins.<\/em><\/td><td><strong>What it says:<\/strong>&nbsp;If oil kills all the otters, then urchins will definitely destroy the kelp beds<br><strong>What it does:<\/strong>&nbsp;Draws a definitive conclusion from the ecosystem relationship described earlier<br><strong>What it is:<\/strong>&nbsp;Author&#8217;s main conclusion<br><strong>Visualization:<\/strong>&nbsp;Oil spill \u2192 otters eliminated (0) \u2192 urchins explode (10,000+) \u2192 kelp beds destroyed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"h-argument-flow\">Argument Flow:<\/h3>\n\n\n\n<p>The argument starts by explaining how sea otters control sea urchin populations, which protects kelp beds from being overeaten. It then jumps to conclude that removing otters through an oil spill would definitely lead to kelp destruction.<\/p>\n\n\n\n<h3 id=\"h-main-conclusion\">Main Conclusion:<\/h3>\n\n\n\n<p>Any oil spill that kills the sea otters in Kedrick Bay would guarantee the destruction of the kelp beds by sea urchins.<\/p>\n\n\n\n<h3 id=\"h-logical-structure\">Logical Structure:<\/h3>\n\n\n\n<p>This is a cause-and-effect argument. The author uses the current ecosystem balance (otters control urchins which protects kelp) to predict what would happen if that balance is disrupted (no otters = too many urchins = destroyed kelp). The logic assumes that otters are the only thing controlling urchin populations.<\/p>\n\n\n\n<h3 id=\"h-prethinking\">Prethinking:<\/h3>\n\n\n\n<h4 id=\"h-question-type\">Question type:<\/h4>\n\n\n\n<p>Weaken &#8211; We need to find information that would make us doubt the conclusion that an oil spill destroying sea otters would guarantee kelp bed destruction<\/p>\n\n\n\n<h4 id=\"h-precision-of-claims\">Precision of Claims<\/h4>\n\n\n\n<p>The conclusion makes an absolute claim using &#8216;guarantee&#8217; &#8211; meaning kelp destruction would be certain and inevitable if otters are eliminated<\/p>\n\n\n\n<h4 id=\"h-strategy\">Strategy<\/h4>\n\n\n\n<p>Look for scenarios that break the causal chain or show alternative outcomes. We need to find ways the kelp beds could survive even without otters, or reasons why urchin populations might not explode as expected. We cannot question the facts given (otters do eat urchins, urchins do eat kelp), but we can question whether removing otters automatically leads to kelp destruction.<\/p>\n\n\n\n<h3>Answer Choices Explained<\/h3>\n\n\n\n<p>A. An oil spill severe enough to destroy the Kedrick Bay otter population would be likely to diminish the populations of other animal species that feed on Kedrick Bay&#8217;s sea urchins.<\/p>\n\n\n\n<p>This choice suggests that an oil spill severe enough to kill otters would also harm other animals that eat sea urchins. While this might seem relevant, it doesn&#8217;t significantly weaken the argument. Even if some other predators of urchins are also affected, the loss of the primary predator (otters) would still likely lead to urchin population growth. The argument could still hold that urchins would increase enough to damage kelp beds, even with some reduction in other predators.<\/p>\n\n\n\n<p>B. If the population of sea otters in Kedrick Bay declined in number as the result of an oil spill, sea otters from other locales would not soon replace them.<\/p>\n\n\n\n<p>This choice states that if otters declined due to an oil spill, they wouldn&#8217;t be quickly replaced by otters from other areas. This actually strengthens rather than weakens the argument. If otters can&#8217;t be quickly replaced, then the urchin population would remain unchecked for longer, making kelp bed destruction more likely, not less likely.<\/p>\n\n\n\n<p>C. In locales where both sea urchins and sea otters are present, sea urchins are the sea otter&#8217;s main food source.<\/p>\n\n\n\n<p>This choice confirms that sea urchins are the main food source for sea otters where both species are present. This information supports rather than weakens the argument&#8217;s premise about the otter-urchin relationship. It doesn&#8217;t provide any reason to doubt that removing otters would lead to urchin population growth and subsequent kelp destruction.<\/p>\n\n\n\n<p>D. Because of the pattern of ocean currents in and around Kedrick Bay, there is little likelihood that even a major oil spill in the area would affect the size of the local sea otter population.<\/p>\n\n\n\n<p>This choice suggests that even a major oil spill is unlikely to affect the otter population due to ocean current patterns. If true, this would mean the hypothetical scenario in the conclusion (otters being destroyed by oil spill) wouldn&#8217;t actually occur. However, this doesn&#8217;t weaken the logical reasoning of the argument itself &#8211; it just questions whether the scenario would happen, not whether the conclusion follows from the premise.<\/p>\n\n\n\n<p>E. The sea urchin population in Kedrick Bay would be likely to be harmed by any oil spill that reduced the size of the local sea otter population.<\/p>\n\n\n\n<p>This choice directly attacks the argument&#8217;s reasoning by suggesting that the same oil spill that harms otters would also harm sea urchins. This breaks the crucial assumption that eliminating otters would automatically lead to urchin population explosion. If urchins are also harmed by the oil spill, their population might not grow large enough to destroy the kelp beds, making the &#8216;guarantee&#8217; of kelp destruction much weaker. This directly challenges the causal chain the argument depends on.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin population from growing large enough to destroy the kelp beds on which the urchins feed. Therefore, any oil spill that destroyed the sea otter population in Kedrick Bay would guarantee the destruction of the kelp beds by the urchins. [&hellip;]<\/p>\n","protected":false},"author":102457,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","ub_ctt_via":""},"categories":[21,44],"tags":[],"featured_image_src":null,"author_info":{"display_name":"Kashish Garg","author_link":"https:\/\/e-gmat.com\/blogs\/author\/kashish\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.1 (Yoast SEO v17.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin.....<\/title>\n<meta name=\"description\" content=\"Sea otters in Kedrick Bay feed on sea urchins and thus keep the local sea urchin population from growing large......with detailed solution\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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