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Crows Have Been Observed to Raise the Water Level in a Tube

Question 2

Multiple Choice

Crows have been observed to raise the water level in a tube by dropping stones into the tube,so that they can then nab a floating worm.It has been suggested that this feat is a display of


A) the availability heuristic.
B) belief perseverance.
C) the framing effect.
D) insight.

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