How do gastropods differ from bivalves?
Molluscs possess a soft body, which is divided in visceral mass and foot. Visceral mass remains covered by special skin called mantle, which is capable of secreting a shell.
Gastropods and Bivalve belong to the same phylum, Mollusc, but different classes due to very striking differences.
Class: Gastropod
- Symmetry: The gastropods are asymmetrical because of an embryonic event, which is called torsion: this could be followed by coiling; visceral mass is covered by a single piece, usually coiled, shell.
- Habitat: They are either aquatic or terrestrial (in damp environment).
- Respiration: The aquatic gastropods have gills while in terrestrial gastropods the mantle cavity is converted into lungs.
- Example: garden snail and slug (shell lost).
Class: Bivalve
- Symmetry: These animals are bilaterally symmetrical. Their body is laterally compressed and is enclosed in two pieces of shells.
- Habitat: Bivalves are aquatic animals.
- Respiration: The process of respiration is carried out by plate-like gills.
- Example: marine mussel and oyster
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Gastropods typically have a single, coiled shell or no shell at all, while bivalves have two shells that hinge together. Gastropods also have a distinct head with eyes and tentacles, while bivalves lack a defined head region. Additionally, gastropods often have a muscular foot used for locomotion, while bivalves use their foot primarily for burrowing or anchoring.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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