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Information and IdeasVery hardEvidence for a claim about a bird's migration route

Information and Ideas practice question

An ornithologist argues that a population of warblers migrates south along the coast rather than across the sea directly.

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

  1. A. Tiny transmitters fitted to 30 of the warblers recorded every bird following the coastline south, with none crossing open water.Correct
  2. B. Warblers are small birds.
  3. C. The warblers leave in September.
  4. D. Other warbler populations are known to cross the sea.

Answer: A. Tiny transmitters fitted to 30 of the warblers recorded every bird following the coastline south, with none crossing open water.

Tracked birds all hugged the coast.

Why the other answers are wrong

B. Warblers are small birds.
Size does not show the route.
C. The warblers leave in September.
Timing does not show the route.
D. Other warbler populations are known to cross the sea.
Other populations are not this one.

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