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Practice Listening: Highlight Correct Summary ID: #4260 Medium Sharks

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Transcript:

Sharks aren't typically thought of as vegetarians. Or even omnivores. But about 10 years ago, scientists documented a dainty relative of the hammerhead shark, known as a bonnethead shark, consuming copious amounts of sea grass. "A lot of people kind of just thought that oh the sharks were consuming it incidentally, while they were going after crabs and squid and other little invertebrates that live in the sea grass meadows." Samantha Leigh, a PhD candidate at the University of California, Irvine. "So everyone thought they were kind of just passing it through their system and not really getting anything from it." So Leigh and her colleagues hauled five of the small sharks back to a Florida lab, and put them on a three-week diet: 90 percent sea grass, 10 percent squid. And analyzed the digestibility of that diet. Turns out, the sharks actually put on pounds, and were able to digest the sea grass just about as well as young green sea turtles do. "Even though the bonnethead shark has what scientists would deem as a carnivorous gut, they are definitely acting like omnivores. Um , so there's probably something going on, on probably a microbial level, that's helping them to break down this sea grass." The full nutrition info is in the Proceedings of the Royal Society B. The study also gives coastal ecosystem managers something new to chew on: these sharks are like lawn mowers, trimming the sea grass, digesting it, and, yes, recycling it. "So they likely play more of a stabilizing role in food web dynamics. They're not a top apex predator.

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On a microbial level, the basic genetics of Bonnethead shark is changing, which is helping them to break down sea grass. This has allowed them to take full nutrition in their date, which also includes crabs and squids. Bonnethead shark consume a lot of sea grass, to check whether they are eating it accidentally while catching prey, they were put in a lab and tested with vegetarian diet. Which showed that they are able to digest the sea grass, enabling them to play a stabilizing role in coastal ecosystem. Hammerhead shark likes to play a stabilizing role in food web dynamics in the sea. They're not a top apex predator, but they are playing a large role in nutrient transport in sea grass meadow ecosystems, by convincing more sharks to include a little side salad in their food habits. Hammerhead shark likes to eat large amounts of sea grass. A lot of scientist think that the sharks are consuming it incidentally, while they try to catch crabs, squids and other little invertebrates that live in the sea grass meadows.

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A.I. Explanation:

Option 1: "On a microbial level, the basic genetics of Bonnethead shark is changing, which is helping them to break down sea grass. This has allowed them to take full nutrition in their date, which also includes crabs and squids."
Explanation: This option incorrectly states that the genetics of the bonnethead shark is changing, which is not mentioned in the text. The text discusses the digestibility of sea grass and the role of microbes, but it does not imply any genetic changes. Additionally, it inaccurately suggests that their diet includes crabs and squids as a primary source of nutrition, while the study focused on their ability to digest sea grass.
Option 2: "Bonnethead shark consume a lot of sea grass, to check whether they are eating it accidentally while catching prey, they were put in a lab and tested with vegetarian diet. Which showed that they are able to digest the sea grass, enabling them to play a stabilizing role in coastal ecosystem."
Explanation: This option accurately summarizes the main points of the text. It mentions the bonnethead shark's consumption of sea grass and the laboratory testing that confirmed their ability to digest it. Furthermore, it highlights their role in stabilizing coastal ecosystems, which aligns with the text's conclusion about their ecological impact.
Option 3: "Hammerhead shark likes to play a stabilizing role in food web dynamics in the sea. They're not a top apex predator, but they are playing a large role in nutrient transport in sea grass meadow ecosystems, by convincing more sharks to include a little side salad in their food habits."
Explanation: This option incorrectly attributes the stabilizing role and nutrient transport to hammerhead sharks instead of bonnethead sharks. It also introduces the idea of 'convincing more sharks' to change their diet, which is not supported by the text. The text specifically discusses the bonnethead shark's behavior and findings from the study, not hammerhead sharks.
Option 4: "Hammerhead shark likes to eat large amounts of sea grass. A lot of scientist think that the sharks are consuming it incidentally, while they try to catch crabs, squids and other little invertebrates that live in the sea grass meadows."
Explanation: This option incorrectly identifies the subject as hammerhead sharks instead of bonnethead sharks. It also misrepresents the text by suggesting that scientists believe the sharks are consuming sea grass incidentally, while the text indicates that the study aimed to determine if the bonnethead sharks were digesting it purposefully. This option fails to capture the main findings of the research.

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