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Information and IdeasEasyFinding supporting a claim about a bird's return

Information and Ideas practice question

A naturalist claims that the same pair of ospreys has returned to the reservoir every spring for the past five years.

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

  1. A. Both birds carry numbered leg rings fitted in the first year, and the same numbers have been read through a telescope each spring since.Correct
  2. B. Ospreys are found on several continents.
  3. C. The reservoir is stocked with fish.
  4. D. Ospreys build large nests.

Answer: A. Both birds carry numbered leg rings fitted in the first year, and the same numbers have been read through a telescope each spring since.

Rings with the same numbers read each year identify the same birds.

Why the other answers are wrong

B. Ospreys are found on several continents.
Range says nothing about these birds.
C. The reservoir is stocked with fish.
Fish explain why ospreys come, not that they are the same pair.
D. Ospreys build large nests.
Nest size is irrelevant to identity.

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