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Terrestrial plants typically carry a negative electrical charge, while hummingbirds and other pollinators tend to accumulate a positive charge. A team of researchers therefore hypothesized that electrostatic attraction (mutual attraction between objects with opposite charges) might enhance pollen transmission between plants and their pollinator species. The team's experiments showed that the maximum positive charge of foraging honeybees is sufficiently high to facilitate electrostatic pollen transfer, a finding that suggests that ____