What is definition cephalopod?

Cephalopods are a class of marine animals characterized by having a prominent head with highly developed sensory organs and a set of arms or tentacles used for locomotion and catching prey. This group includes octopuses, squids, cuttlefish, and nautiluses. Cephalopods are known for their remarkable intelligence, with some species exhibiting complex behaviors and problem-solving abilities. They are also notable for their highly efficient jet propulsion systems, ability to change color and texture, and their use of ink as a defense mechanism. Cephalopods are found in all the world's oceans and range in size from less than an inch to more than 30 feet in length. They play important roles in marine ecosystems as both hunters and prey, and are also valuable sources of food for humans.