no, they are invertebrates
No, a mollusc is a mollusc.
sand burrowing mollusc
rine mollusc's homne
Molluscs are animals which have no backbone (invertebrates) and no exoskeleton. These include snails (they have an outer shell but it isn't an exoskeleton) slugs (no shell, no exoskeleton, no bones) octopuses (they have no bones. They aren't fish because all fish have bones.) Sea snails and periwinkles are just other types of snail.
The economic importance of mollusc is that there are a staple food in many countries.
No.
No, its a Mollusc
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yes it is
yes.
No they are arachnids
No. Fish have back bones (like us). Squid are molluscs (like octopuses, snails, oysters, etc.)