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Limpets leave a zigzag trail on rocks as they move along scraping off algae and seaweed with their strong teeth.
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Limpet Teeth Marks

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Rough periwinkles sit on a bed of barnacles.
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A Seashore Walk

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An ARMS covered in growth after being underwater for a specified period of time.
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ARMS Covered in Growth

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Scientists use satellite images of the ocean to estimate chlorophyll concentrations in the water. You can see the yellow swirls of phytoplankton concentrated at the sea surface in this image.
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Satellite Image of Chlorophyll Concentration

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Encrusted pumice
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Encrusted Pumice

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