Soft bodies
Their foot
snail squid octopos
All mollusks possess a soft body covered by a hard shell, a muscular foot for movement, and a mantle that secretes the shell. These characteristics distinguish mollusks from other phyla in the animal kingdom.
The presence of he shell, the type of shell, the type of foot, and the type of nervous system
the 8 groups of invertebrates are the arthropods, poriferans, platyheminthes, coelenterates, nematoeds, mollusks, echinoderms, and annelids
All mollusks exhibit bilateral symmetry, meaning their body can be divided into two mirror-image halves along one plane. While some mollusks, such as bivalves, have hinged shells, this trait is not universal among all mollusks. Radial symmetry and the ability to swim are also not characteristics found in all mollusks. Thus, bilateral symmetry is the defining feature present in all members of this diverse phylum.
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The three primary characteristics of mollusks are a mantle with a cavity for breathing and excretion, a radula, and the structure of the nervous system. Squid and other cephalopods have all of these characteristics.
Mollusks are invertebrates because they do not have a backbone.
I think you mean "Cephalopods". They are a group of mollusks and include octopuses, squids, cuttlefishes, and nautiluses.
Cephalopods and mollusks are both part of the phylum Mollusca, but they have distinct characteristics. Cephalopods, such as octopuses and squids, are known for their advanced nervous systems, complex behaviors, and ability to change color and texture for communication and camouflage. Mollusks, which include snails, clams, and oysters, typically have a softer body covered by a hard shell and exhibit a wider range of body structures and habitats. Both groups possess a muscular foot and a mantle, which plays a crucial role in respiration and shell formation.