the answer is cephalopods which means head-foot
Mollusks are defined as Bivalves. They are called Bivalves because they have two shells. Cnidarians such as Jelly Fish do not have shells which define a bivalve (mollusks).
most have shells
?
It is the most complex type of mollusks.
Most are in water.
cephalopod
In the seas
Most mollusks are free-living but there are a few that are parasitic.
It enables members to develop specialized knowledge of the matters under their jurisdiction
Cephalopods are considered the most advanced mollusks due to their complex nervous systems, highly developed brains, and sophisticated behaviors, which include problem-solving and social interaction. Their ability to rapidly change color and texture for communication and camouflage showcases advanced sensory processing and motor control. Additionally, cephalopods exhibit unique features such as jet propulsion for movement and specialized appendages that allow for intricate manipulation of their environment. This combination of traits sets them apart from other mollusks, highlighting their evolutionary success.
The Kingdom Protista has the most members without structures for movement. This kingdom includes single-celled organisms such as protozoans and algae that may not have specialized structures for locomotion.
Members of the class Aplacophora are mollusks that have an internal plate instead of a shell. Aplacophorans lack a protective shell but possess calcareous spicules or scales in their skin. These marine mollusks are often found in deep sea environments.