Biologists categorize the cue that stimulates young herring gulls to peck as a sign stimulus because the pecking
behavior ____.
a. requires learning to perfect
b. is a cue released by the baby gulls to their parents
c. is triggered by presentation of the cue
d. is only triggered by the cue if it is accompanied by species-specific behaviors
e. appears both in the presence and absence of the cue
ANSWER: c
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