What is the significance of bivalve molluscs (insert at least four values)? Give examples.

1) filter feeders of fresh water (for example, toothless, pearl barley) and sea (for example, mussel, oyster, scallop) water bodies;
2) participants in food chains; human food (for example, oyster, mussel, scallop);
3) sources of pearls and mother-of-pearl (for example, pearl barley, pearl mussel);
4) pests of wooden ship bottoms and piles (for example, mussel, ship worm).

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