bilateral symmetry
Pisces are fish and an Octopus is a cephalopod. For instance fish show bilateral symmetry and have a backbone while an Octopus has no backbone and shows 8 fold symmetry in part.
A cephalopod is a snail.
I think you mean "cephalopod". A cephalopod is any member of the molluscan class Cephalopoda (which means "head-foot"). These exclusively marine animals (salt water only) are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles. Two examples of cephalopods are octopus and squid.
A cephalopod is a mollusk and an invertebrate; it has no skeleton neither external nor internal.
Yes they are
A octopus is a cephalopod that has no shell. Also squid have internal shells that are not used for protection.
Cephalopod
A cephalopod.
The only extant cephalopod that produces an external shell is the chambered nautilus. The shells produced by squid and cuttlefish are internal.
cephalopod
Mesonychoteuthis hamiltoni
Mollusca