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Intertidal Zones

Intertidal Zones

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openable covering made of two movable shell plates. The modified legs (cirri) of the barnacle extend out of this opening to snag their tiny planktonic food. The operculum can be closed to protect the barnacle from predators, from fresh water, and the drying conditions of exposure at low tide. Although the shells are hard, you

  Plate, Shell

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