Which of the following is NOT one of the eight parts of speech recognized by traditional grammar?

What type of restorative material can appear more distinctly radiopaque compared to composite resin due to an addition of a metal alloy used to reinforce the material?

What will be an ideal response?

High levels of serotonin have been related to hyper-responsiveness and impulsivity.

Answer the following statement true (T) or false (F)