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Question 153·Hard·Central Ideas and Details

Headlines frequently credit recent improvements in crop yields to the tireless work of honeybees, yet agronomist Lidia Perez argues that such coverage obscures the real story. In her study of small-scale farms in southern Spain, Perez found that yield increases correlated more closely with the presence of diverse native pollinators—solitary bees, hoverflies, even nocturnal moths—than with managed honeybee hives. She adds that honeybees can compete with these indigenous species for pollen, sometimes depressing their numbers, and that certain crops, including tomatoes and almonds, require pollination techniques honeybees cannot perform. Perez does not advocate eliminating honeybee colonies; rather, she says, people should recognize them as only one component of a far more intricate pollination network.

Which claim about honeybees is most strongly suggested by the passage?