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Like all clams, they have evolved into a specialized environment over time. Clams began as marine mollusks, but some of them developed the ability to survive in freshwater places where rivers empty into the sea. Those that were able to move further up the river had less predation and survived again. This goes on until freshwater clams are fully a part of the ecosystem and fit in with freshwater predators and freshwater mollusk diseases and have life-cycles and reproduction that matches the advantages of the environment.

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14y ago

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