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bees(6)
colony collapse(6)
honey bees(6)
pollen(3)
death rates(2)
foraging(2)
winter(2)
agricultural land(1)
agriculture(1)
brazil(1)
cell communication(1)
chemical equilibrium(1)
colony collapse disorder(1)
flight (biology)(1)
geomagnetism(1)
global warming(1)
gravitation(1)
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honey(1)
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