Information and IdeasMediumEvidence that a stream is recovering
Information and Ideas practice question
A conservation group claims that a stream polluted by a factory closure in 2010 has recovered.
Which finding, if true, would most directly support the claim?
- A. Surveys found no mayfly larvae, which cannot live in polluted water, in the stream from 2010 to 2015, but found them at every survey point in 2023.Correct
- B. The factory closed in 2010.
- C. The stream is popular with walkers.
- D. The group has fifty members.
Answer: A. Surveys found no mayfly larvae, which cannot live in polluted water, in the stream from 2010 to 2015, but found them at every survey point in 2023.
A pollution-sensitive species has returned.
Why the other answers are wrong
- B. The factory closed in 2010.
- The cause, not the recovery.
- C. The stream is popular with walkers.
- Walkers do not show water quality.
- D. The group has fifty members.
- Membership is irrelevant.
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