What is the significance of mollusks in nature and human life?

Shellfish in nature:

eat animals and fish;
participate in the formation of sedimentary rocks (shells);
help to cleanse reservoirs by filtering water;
harm agriculture – damage crops, vegetables, vineyards.

Shellfish in human life:

eaten (squid, oysters, mussels, octopuses);
pearls ripen in shells, they are used for jewelry, like some shells;
ink (octopus, cuttlefish) is used in the paint and varnish, printing industry, and medicine.

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