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Whitetip reef sharks spend most of the day lying on the ocean floor. While remaining still, these sharks pump water across their gills. The movement of water across their gills is necessary for
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Whitetip reef sharks spend most of the day lying on the ocean floor. While remaining still, these sharks pump water across their gills. The movement of water across their gills is necessary for

User Peter Cullen
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water purification and to remove toxins from the water
User Rgiar
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Answer:obtaining oxygen

User Jen
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