Depending on species you have a large variety of sizes.
No.
NO it is not a fish
8
Octopuses don't!
No.
Yes
On my calculations the blue ringed octopus is more dangerous than the blue lined octopus because it is very poisonous and it has no cure.
Seals, sharks, eels, and even other octopuses.
yes
Yes they are cold blooded
The octopus habitat depends on the type of octopus. The majroity of octopus makes it home on the ocean floor in cracks and crevices in the rock formations.
no there is no such thing as a tree octopuse