Final answer:
A division of the assembly belongs to the class of motions called diarthrosis, which are freely mobile joints.
Step-by-step explanation:
A division of the assembly belongs to the class of motions called diarthrosis, which are freely mobile joints. Diarthroses include all synovial joints of the body that provide majority of body movements. They are classified as uniaxial, biaxial, or multiaxial joints based on the number of axes of motion they provide.