A cephalopod is a snail.
A cephalopod is a mollusk and an invertebrate; it has no skeleton neither external nor internal.
Squid are a type of cephalopod. They do not live in shallow water, even though they may venture there, they prefer to live in deep water.
Yes they are
A octopus is a cephalopod that has no shell. Also squid have internal shells that are not used for protection.
The octopus is an invertebrate, therefore it cannot be a fish, which belong to the group of animals known as vertebrates. The octopus is a mollusc, and from the same group as squid and cuttlefish.
A cephalopod.
Cephalopod
bilateral symmetry
The only extant cephalopod that produces an external shell is the chambered nautilus. The shells produced by squid and cuttlefish are internal.
Mollusca
Yes it is. Specifically it is a cephalopod.