The clam gets only one chance to find a nice home. Once it fastens
itself to a spot on a reef, there it sits for the rest of its life.clams achieve their enormous proportions by consuming the sugars
and proteins produced by the billions of algae that live in their
tissues. In exchange, they offer the algae a safe home and regular
access to sunlight for photosynthesis, basking by day below the water's
surface with their fluted shells open and their mulch-colored mantles
exposed. They also use a siphon to draw in water to filter and consume
passing plankton.
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