10. what are the three most common classes in phylum mollusca? give two animal examples for each class.

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# Brief Explanations:
To answer this, we recall the taxonomy of phylum Mollusca. The three most common classes are Gastropoda, Bivalvia, and Cephalopoda. For Gastropoda (snails, slugs), examples include garden snails (Helix aspersa) and banana slugs (Ariolimax columbianus). For Bivalvia (clams, mussels), examples are blue mussels (Mytilus edulis) and quahogs (Mercenaria mercenaria). For Cephalopoda (octopuses, squids), examples are common octopuses (Octopus vulgaris) and giant squids (Architeuthis dux).
# Answer:
The three most common classes in phylum Mollusca are:
1. **Gastropoda** - Examples: Garden snail ($Helix$ $aspersa$), Banana slug ($Ariolimax$ $columbianus$)
2. **Bivalvia** - Examples: Blue mussel ($Mytilus$ $edulis$), Quahog ($Mercenaria$ $mercenaria$)
3. **Cephalopoda** - Examples: Common octopus ($Octopus$ $vulgaris$), Giant squid ($Architeuthis$ $dux$)

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