17.4. Which of the following, if true, would most clearly demonstrate the interaction mentioned in lines 11-13?
Female larks respond similarly both to short, simple songs and to longer, more complicated songs.
Male canaries use visual ornamentation as well as elaborate song repertoires for mate attraction.
Both male and female blackbirds develop elaborate visual and vocal characteristics.
Male jays use songs to compete among themselves and to attract females.
Male robins with elaborate visual ornamentation have as much reproductive success as rivals with elaborate vocal characteristics.
17.5. The passage indicates that researchers raised female cowbirds in acoustic isolation in order to
eliminate confounding variables
approximate field conditions
measure reproductive success
quantify repertoire complexity
prevent early mating
17.6. According to the passage, the song sparrow is unlike the warbler in that the song sparrow
uses songs mainly in territorial behavior
continuously composes long and complex songs
has a much larger song repertoire
repeats one song type before switching to another
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