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题目材料：
Recently researchers have questioned the portrayal of pearly mussels, which are freshwater bivalves, as feeding exclusively on particles suspended in water (suspension feeding). Many ocean-dwelling bivalves siphon food from the sediment surface (deposit feeding) or use their foot to sweep edible material from the sediment (pedal feeding). It is known that juvenile pearly mussels can pedal feed, although researchers still do not know how the ability to pedal feed varies across species, over the lifetime of a single mussel, or with the relative availability of food in the sediment.
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