Multiple Choice
Why do biologists categorize the cue that stimulates young herring gulls to peck as a sign stimulus?
A) because the pecking behaviour is completely instinctive
B) because the pecking behaviour requires learning to perfect
C) because the pecking behaviour appears both in the presence and absence of the cue
D) because the pecking behaviour is triggered by presentation of the cue
Correct Answer:

Verified
Correct Answer:
Verified
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