All cephalopods (octopus, squid and cuttlefish) require saltwater of the proper temperature (species dependant), a suitable habitat (species dependant), and proper nutrition (fish and invertebrates).
They live in various depths in the ocean
No. Squids and octopi are a class of mollusks called Cephalopods, and as with all mollusks, cephalopods are invertebrates.
Octopus, cuttlefish and squid are all cephalopods. http://en.wikipedia.org/wiki/Cephalopod
Yes, all mammals, reptiles, avians, amphibians, insects, arachnids, crustaceans, piscines, gastropods, cephalopods, annelids, etc. are all animals.
no
No, they are birds.
No, they are cephalopods.
Actually, the Mantis Shrimp are said to have the best eyes in the invertebrates. The cephalopods have the best developed brains. That being said, cephalopods do have excellent vision.
Yes, all animals need habitat to live.
food they all need food
You need trees to live because they are the biggest plant to give oxygen.And you all need oxygen to breathe, to live.
They have gills.