GRE Sample Test 4 Verbal Reasoning 2

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11
Question 11 is based on the passage below.
Although sharks are classified as fish, they differ significantly in several respects from other freshwater and saltwater fish. Mostsignificantly, a shark’s skeleton is composed of lightweight, flexible cartilage, providing an advantage in hunting other marine life;other super classes of fish have stable calcified skeletons. Additionally, sharks possess no swim bladder, the small organ that allowsmost fish to control their buoyancy; instead, a substantial liver filled with oil works to keep the sharks afloat.
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