What is the effect of a sedentary lifestyle on the organization of mollusks?

A sedentary lifestyle has a diverse effect on molluscs, which manifests itself in the following aspects:
1) some of the mollusks are forced to lead a parasitic lifestyle;
2) the smallest individuals of the group under consideration are characterized by the absence of visual organs and a reduced head;
3) many of the animals under consideration are filter feeders.



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