Investigation - Marvel Education

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Practice Listening: Highlight Correct Summary ID: #3953 Short Investigation

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Transcript:

A new investigation into shark populations in the waters off Australia has discovered that there are two distinct species of Great White shark, one to the east and one to the west of Bass Strait. This was discovered by tagging large numbers of sharks in the coastal waters all round Australia. Rather to the investigators' surprise, they found that while sharks from the east side certainly travelled to the west side of the continent and vice versa, they always returned to their home areas to breed. The two types of shark were found to have a distinct genetic make-up, indicating that interbreeding has not taken place. The implication of these research findings is that sharks may be more susceptible to changes in local marine environments than had previously been thought.

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There are fewer great white sharks in Australian waters than was once believed. This is because tagging has shown that sharks travel considerable distances, and a shark recorded east of bass strait one week is often recorded west of bass strait the next. However, sharks always return to their place of origin to breed. A recent research study has shown that Australian great white shark populations have remained surprisingly distinct as, despite traveling long distances, these sharks do not breed away from their original areas. This means that local shark habitats may have a greater effect on sharks than has been believed up to now. There is a greater variety in the great white shark populations in Australian waters than was previously thought to be the case. This means that some types of shark are actually more endangered than was believed. Scientists are therefore developing conservation programs which will help to protect these threatened species. An investigation of great white sharks in Australian waters has come up with some unexpected conclusions, as it found that the genetic make-up of sharks in one area was quite distinct from those found elsewhere. This made scientists realize that sharks do not swim as far away from their home areas as used to be bought.

Result:

A.I. Explanation:

Option 1: "There are fewer great white sharks in Australian waters than was once believed. This is because tagging has shown that sharks travel considerable distances, and a shark recorded east of bass strait one week is often recorded west of bass strait the next. However, sharks always return to their place of origin to breed."
Explanation: This option incorrectly states that there are fewer great white sharks in Australian waters, which is not mentioned in the text. The text focuses on the distinct species and their breeding habits rather than population numbers. Additionally, while it mentions that sharks travel considerable distances, it does not imply that they are recorded frequently moving between the two sides of Bass Strait. The main idea of the text is about the distinct genetic make-up and breeding behavior, not about a decrease in population.
Option 2: "A recent research study has shown that Australian great white shark populations have remained surprisingly distinct as, despite traveling long distances, these sharks do not breed away from their original areas. This means that local shark habitats may have a greater effect on sharks than has been believed up to now."
Explanation: This option accurately summarizes the main findings of the text. It highlights that there are two distinct species of great white sharks in Australia and emphasizes their breeding behavior, which is that they return to their original areas despite traveling long distances. The implication regarding local habitats affecting the sharks aligns with the text's conclusion about their susceptibility to changes in marine environments, making this option the correct summary.
Option 3: "There is a greater variety in the great white shark populations in Australian waters than was previously thought to be the case. This means that some types of shark are actually more endangered than was believed. Scientists are therefore developing conservation programs which will help to protect these threatened species."
Explanation: This option misrepresents the findings of the text by suggesting that there is a greater variety in shark populations and that some types are more endangered. The text specifically discusses two distinct species and their genetic make-up, not a greater variety. Furthermore, it does not mention conservation programs or endangerment, making this option incorrect.
Option 4: "An investigation of great white sharks in Australian waters has come up with some unexpected conclusions, as it found that the genetic make-up of sharks in one area was quite distinct from those found elsewhere. This made scientists realize that sharks do not swim as far away from their home areas as used to be bought."
Explanation: This option incorrectly states that sharks do not swim as far away from their home areas as previously thought. The text indicates that sharks do travel considerable distances but always return to breed in their original areas. While it mentions the distinct genetic make-up, it does not imply that sharks do not swim far, making this option misleading and incorrect.

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