Příklad 01
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A brief research report published on ScienceDaily website states the following:
The narwhal (Monodon monoceros), an iconic whale of remote Arctic waters, is widely known for its long, spiral tusk, which is really an elongated tooth. The tusk, which is predominantly found in males and can grow up to 10 feet long, is one of the most fascinating traits in nature and the inspiration for myths such as the unicorn. It is believed to play a role in competition for mates, including mating displays. The tusk may have others uses and its function is still debated, primarily because few people have observed how these elusive animals use their tusks in the wild. Limited field observations also means that little is known about many other aspects of the behavior of this highly gregarious Arctic whale, including social and reproductive behaviors, how they adapt to changing environmental conditions, or whether narwhals engage in behaviors that are not linked directly to fitness, like play.Using drones, researchers from Florida Atlantic University's Harbor Branch Oceanographic Institute, and Canada's Department of Fisheries and Oceans, in partnership with Inuit communities in Nunavut, provide the first evidence of narwhals using their tusks in the wild to investigate, manipulate and influence the behavior of Arctic char (Salvelinus alpinus), including delivering sufficient force with their tusks to stun and possibly kill the fish. Researchers captured 17 distinct behaviors, which shed light on the dynamics between the narwhal, its prey and avian competitors. Results of the study, published in the journal Frontiers in Marine Science, also reveal the first evidence of likely play, specifically exploratory-object play, in narwhals as well as other fascinating insights into narwhal behavior in a changing Arctic. Aspects of the narwhals' actions for example, may also have included social learning, and possibly social instruction and personality differences among individual narwhal. These novel findings further enrich our understanding of narwhals' complex behavior.
Findings also provide the first reports of interactions between narwhal, fish and birds, including attempted kleptoparasitism, a "food thief" situation, among narwhals and glaucous gulls (Larus hyperboreus). The narwhals exhibited remarkable dexterity, precision and speed of movement of the tusk, and regularly made adjustments to track the moving target. The tusk, especially the tip of the tusk, was used to interrogate and manipulate the target by brief contacts, which typically elicited a response from the fish. This research highlights how environmental changes might introduce new interspecies encounters, challenging Arctic species to adapt.Based on the information in the text, decide which of the following statements is true:
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- a) Scientists do not have enough information about narwhals mainly because of their gregarious nature.b) Previous studies of narwhals were not properly funded.c) Researchers have now completed a list of all possible uses of narwhal's tusk.d) Drones confirmed the theory of narwhal's tusk being used to kill fish.e) It is possible that environmental shifts would lead to interactions between species not observed before.
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Výsledek příkladu
e) It is possible that environmental shifts would lead to interactions between species not observed before. -
Postup řešení
Modrá věta v textu říká, že zmiňovaný výzkum podtrhuje roli enviromentálních změn ve vytváření nových vzorců chování mezi různými druhy zvířat. Správná odpověď je e) - Enviromentální změny budou možná vést k dříve nepozorovaným setkáním mezi druhy.