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A giant clam eats zooplankton (tiny animals) and phytoplankton (tiny plants) out of the water by filtering through their gills. Clams share a symbiotic relationship with algae that live on their mantle (the skin inside the shell). The clams sit with their mouths wide open in the sun so the algae can use photosynthesis to feed the clam (if the algae don't get enough sun and start to die, the clam eventually will too). The algae feed off of the clams' waste, also, the water the clams suck in provides needed oxygen for the algae. The clam also eats some of the algae each night.
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9y ago

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