Which type of gypsum board is used for shaft walls and solid partitions?

Which of the following have connections to the premotor cortices?

a. Somatosensory association areas b. Supplementary motor areas c. Prefrontal areas d. All of the above

The mandibular first molar differs from other teeth and is the exception because:

A. the root is not bifurcated B. the distal root has two pulp canals C. the mesial root has two pulp canals D. there are six cusps