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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?

  1. 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
  2. B. The factory closed in 2010.
  3. C. The stream is popular with walkers.
  4. 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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