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phylum mollusca (main characteristics :star: (gaseous exchange by gills,…
phylum mollusca
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locomotion
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it will pump blood ,causing it to swell-act as an anchor in mud/sand
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class BIVALVIA 
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part of the mantel is drawn out into long muscular siphons to allow the clam to burrow into the mud or sand & extend the siphons to water above.
have 3-chambered heart that pump blood through the gills and mantel for oxygenation & to kidney for waste elimination
REPRODUCTION
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fertilizes egg develop into a swimming form called trochophore larva
and elongates become veliger larva
class GASTROPODA
have TORSION process
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clean , undisturbed water enter mantle cavity.
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