The two pieces of evidence that best support the inference that people have been more concerned with the health of honeybees than wild bumblebees in recent years are:
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the causes of bumblebee die-offs have been largely understudied - This suggests a lack of focus or concern on bumblebees compared to honeybees, as their decline is not receiving the necessary attention.
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people are more familiar with honeybee die-offs - This indicates that honeybee issues have garnered more public awareness and concern compared to those of wild bumblebees.