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Moreover the puerto rican(25 twig species closely

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Unformatted text preview: Moreover, the Puerto Rican (25) twig species closely resembles the twig species of Cuba, Hispaniola, and Jamaica in morphology, habitat use, and behavior. Likewise, the spe- (30) ts for other habitats are similar across the islands. The presence of similar species on different islands could be variously explained. (35) An ancestral species might have adapted to exploit a particular ecological niche on one island and then traveled over water to colonize other (40) islands. Or this ancestral species might have evolved at a time when the islands were connected, which some of these islands may once (45) have been. After the islands separated, the isolated lizard populations would have become distinct species while also retaining their ancestors’ niche (50) adaptations. Both of these scenarios imply that speciali- zation to each niche occurred only once. Alternatively, each spet could have arisen (55) independently on each of the islands. If each type of spet evolved just once, then similar 26 spets on different islands (60) would be closely related. Conversely, if the spets evolved independently on each island, then a spet on one island would be more closely (65) related to other types of anoles on the same island—regardless of their ecological niches— than it would be to a similar spet on a different island. (70) Biologists can infer how species are related evolu- tionarily by comparing DNA sequences for the same genes in different species. Species (75) with similar DNA sequences for these genes are generally more closely related to each other than to species with less- similar DNA sequences. DNA (80) evidence concerning the anoles led researchers to conclude that habitat spets on one island are not closely related to the same habitat spets (85) elsewhere, indicating that spe- ts evolved independently on each island.-------------------------------------------------------------------------------- Q24: The primary purpose of the passage is to A. describe some unusual features of anole lizard species B. account for a particular type of behavior found among anole lizard species C. contrast two types of evidence that have been used to support a particular hypothesis concerning anole lizard species D. explain how researchers resolved a particular scientific question concerning anole lizard species E. examine different explanations for a particular trait common to certain anole lizard species Answer: -------------------------------------------------------------------------------- Q25: Which of the following best describes the purpose of the sentence in lines 13-23 (“What is … Jamaica”)? 27 A. It raises a question about why coexisting anole lizard species occupy the different types of habitats mentioned in the first sentence....
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Moreover the Puerto Rican(25 twig species closely resembles...

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