Expression of IdeasVery hardGeneralisation supported by two cases
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- In 1995 wolves were returned to Yellowstone National Park.
- With wolves present, elk moved away from riverbanks, and willows there recovered.
- In 2015 beavers were returned to a river in Devon, England.
- The beavers' dams reduced flooding downstream.
The student wants to make a generalisation about returning missing species and support it with both examples. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Returning a missing species can reshape a whole landscape: Yellowstone's wolves let its riverbank willows recover, and Devon's beavers reduced flooding downstream.Correct
- B. Wolves were returned to Yellowstone in 1995 and beavers to Devon in 2015.
- C. With wolves back in Yellowstone, elk left the riverbanks and the willows recovered.
- D. Devon's beavers reduced flooding, which proves that returning any species improves any landscape.
Answer: A. Returning a missing species can reshape a whole landscape: Yellowstone's wolves let its riverbank willows recover, and Devon's beavers reduced flooding downstream.
A general claim followed by both cases — choice A alone does both.
Why the other answers are wrong
- B. Wolves were returned to Yellowstone in 1995 and beavers to Devon in 2015.
- Two dates, no generalisation about effects.
- C. With wolves back in Yellowstone, elk left the riverbanks and the willows recovered.
- One example, no generalisation.
- D. Devon's beavers reduced flooding, which proves that returning any species improves any landscape.
- A generalisation from one case, and 'any species, any landscape' goes far beyond the notes.
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