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What do the parietal bones form?

  1. The base of the skull

  2. The sides and top of the cranium

  3. The facial structure

  4. The spine

The correct answer is: The sides and top of the cranium

The parietal bones form the sides and the top of the cranium, making them an integral part of the skull structure. This may seem confusing, as the base of the skull is made up of multiple other bones such as the occipital bone and sphenoid bone. The facial structure is composed of other bones such as the mandible and maxilla, and the spine is formed by the vertebrae. While all of these structures are integral parts of the skeletal system, they are not formed by the parietal bones. Therefore, options A, C, and D are incorrect.