Which of the following structures is/are not involved with some mechanism of movement in animals?

Question

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Blastopore is a structure involved in embryonic development and does not play a role in movement in animals. The other structures listed are all involved in movement in some way - the fluid-filled coelom aids in movement and provides support, segmentation allows for more controlled and efficient movement, appendages are used for locomotion, and cilia are involved in movement and transportation of materials.

Which of the Following Structures Is/are Not Involved with Some