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An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center
An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center
An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves
The sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other
Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance
A system designed to transport food and other necessary substances throughout a creature's body
A sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs respiration
A tough, multilayered structure secreted by the mantle, generally used for protection, but sometimes for body support
A muscular organ that is used for locomotion and takes a variety of forms depending on the animal
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