The ____ bones are between the sphenoid and nasal bones. 

Porcelain teeth are ____________

a. less resistant to stain and wear than acrylic teeth b. more brittle than the acrylic teeth c. not as noisy when the patient is eating or talking d. none of the above

The condenser and iris diaphragm control the amount of light that enters a microscope

Indicate whether the statement is true or false