Question

in 2006, a team of scientists at the university of washington launched a multi - year study exploring memory and communication in crow communities. first, a researcher temporarily trapped seven local wild crows while wearing a distinctive mask bearing a \fearsome\ expression. throughout the following years, researchers would occasionally wear either the \fearsome\ mask or a
eutral\ mask while walking around and feeding the resident crows. the seven crows that had been captured - and many other crows that had never been captured - would caw angrily at the person in the \fearsome\ mask, but ignore the person in the
eutral\ mask. these observations suggest that crows are capable of ______ which choice most logically completes the text? choose 1 answer: a learning about a threatening human from other crows. b relying solely on scent to identify human threats.

Explanation:

The text shows that crows that were not captured also reacted to the "fearsome" mask. This implies they learned about the threatening human from the captured crows. Option B is incorrect as the study focused on masks (visual) not scent.

Answer:

A. learning about a threatening human from other crows.