Question ID:PT80 S4 Q25 Passage:Scientist: A small group of islands near Australia is inhabited by several species of iguana; closely related species also exist in the Americas, but nowhere else. The islands in question formed long after the fragmentation of Gondwana, the ancient supercontinent that included present-day South America and Australia. Thus, these species‚  progenitors must have rafted on floating debris across the Pacific Ocean from the Americas. Stem:Which one of the following, if true, most weakens the scientist's argument? Correct Answer Choice:DChoice A:A number of animal species that inhabit the islands are not found in the Americas. Choice B:Genetic analysis indicates that the iguana species on the islands are different in several respects from those found in the Americas. Choice C:Documented cases of iguanas rafting long distances between land masses are uncommon. Choice D:Fossils of iguana species closely related to those that inhabit the islands have been found in Australia. Choice E:The lineages of numerous plant and animal species found in Australia or in South America date back to a period prior to the fragmentation of Gondwana.