PrepTest 104, Section 2, Question 21
Many birds that form flocks compete through aggressive(453 more words not shown)
Which one of the following(9 more words not shown)
- AAmong Harris sparrows,(9 more words not shown)
- BAmong Harris sparrows,(9 more words not shown)
- CAmong Harris sparrows,(16 more words not shown)
- DJuvenile Harris sparrows(11 more words not shown)
- EHarris sparrows engage(9 more words not shown)
Reading the passage
We know the Harris sparrow findings don't establish individual-status signaling within an age class. We also know they aren't useless: adults usually have darker throats and higher status than juveniles. For this inference question, we'll need to check what follows from those findings and the earlier explanation of how flock status works.
Working the answers
- A
This reverses the distinction. Plumage indicates broad age-related differences; the writer says it does not signal individual status within an age class.
- BCorrect
Join two statements: adults have higher status than juveniles, and higher status gives priority of access to resources such as food. Adults therefore have priority over juveniles when it comes to food. The answer isn't stated in one sentence, but both pieces are supplied.
- C
We never compare these two groups' status. Dyeing juveniles to resemble adults makes them dominant over undyed juveniles; it doesn't establish equality with light-plumaged adults.
- D
We don't learn whether juveniles fight more frequently than adults. Higher or lower status doesn't tell us how often each group fights.
- E
Nothing compares how frequently sparrows and titmice fight. The studies compare the evidence for signaling, not the species' rates of aggression.
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