In which habitats do molluscs live?

In which habitats do molluscs live?
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Molluscs can be found in the sea, freshwater and in terrestrial environments.
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How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

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What are examples of the ecological and economic importance of molluscs?

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What is the function of the feet in molluscs? How is the mollusc foot related to the name given to the classes of the phylum?

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What type of exoskeleton do some molluscs present?

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How is the excretory system of molluscs characterized?

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Which type of circulatory system do molluscs have? How can it be compared to the respiratory system of annelids?

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How is the respiratory system in aquatic molluscs characterized? What adaptive respiratory structure do terrestrial molluscs present?

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What is the type of digestive system in molluscs?

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Are mollusc metameric beings? Exclusively analyzing this feature could it be said that molluscs are evolutionarily proximal to nematodes or to annelids?

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