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Information and IdeasMediumEvidence that a weed, not fishing, is reducing fish

Information and Ideas practice question

A biologist argues that a lake's fish are declining because of an invasive weed rather than because of fishing.

Which finding, if true, would most directly support the claim?

  1. A. Fish numbers have fallen only in the bays where the weed has spread and have held steady in the open water where fishing is heaviest.Correct
  2. B. The lake is popular with anglers.
  3. C. The weed was first seen in 2015.
  4. D. Fish numbers in the lake have fallen by half.

Answer: A. Fish numbers have fallen only in the bays where the weed has spread and have held steady in the open water where fishing is heaviest.

Decline follows the weed, not the fishing.

Why the other answers are wrong

B. The lake is popular with anglers.
Popularity does not separate the causes.
C. The weed was first seen in 2015.
A date does not separate the causes.
D. Fish numbers in the lake have fallen by half.
The decline itself, with no cause.

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