the answer is cephalopods which means head-foot
Cephalopods are a phylum of mollusks that include squids, octopi, the chambered nautilus, and cuttlefish. All cephalopods have tentacles, most are carnivores, and they are all mollusks. All mollusks have a radula, or toothy tongue, a mantle, or thin layer of tissue that covers the organs and makes the shell, and a muscular foot.
Most of Mollusks protect themselves with help of shell . Shell is hard protective covering made up of CaCO3. Cephalopods are not protected by shell .
They are most related to other cephalopods like squid or cuttlefish. They are distantly related to other mollusks such as oysters or slugs.
They may learn certain behaviors, but most behaviors such as eat and moving are inherited.
cephalopods, as they have sensory organs closest to vertebrates.
Cephalopods, such as octopuses and squids, have a closed circulatory system. This system consists of a heart that pumps blood through a series of vessels for efficient distribution of oxygen and nutrients to tissues and organs.
Some adaptations of mollusks include an operculum that most univalves have for protection, the radula of the moon snail that is used to drill through other shells to get their food, and the jet propulsion movement and ink sac of cephalopods to escape predators. - a jeark
Some, such as octopii, possess a brain, but most mollusks just have concentrations of nerve cells in their body that serve as primitive brains, called ganglia (singular ganglion). To add to the previous answerer, Cephalopods (squids, chambered nautilus, octopi, cuttlefish) have a brain.
the octopus or a squid
Some adaptations of mollusks include an operculum that most univalves have for protection, the radula of the moon snail that is used to drill through other shells to get their food, and the jet propulsion movement and ink sac of cephalopods to escape predators.
Mollusca is a phylum of invertebrates that typically have a soft body covered by a hard shell. They possess a muscular foot for movement, a visceral mass containing internal organs, and a mantle that secretes the shell. Most mollusks also have a radula, a rasping organ used for feeding.