An octopus is none of the three mentioned. It is classed as a cephalopod.
No, they are cephalopods which are invertebrates. Fish are vertebrates.
A whale is a mammal. They were probably classed as fish because they swim in water.
An octopus is a mollusk
Since the last time I checked, fish.
an octopus is not a devilfish
A devilfish octopus eats crabs and other things.
An octopus is a mollusk
knowledge + fish = octopus
Cuttle fish and Octopus
cuttle fish and octopus
knowledge + fish = octopus