Which (extracted) incisors are the most difficult to identify as right or left?

This tooth __________________________has two or three pulp horns.  (Select the correct premolar with this discriptor use the DAQT is required in your answer)  

Balance the chemical equation below. Use 1 as a placeholder as necessary. Every blank should have a number. Al + Br2

This tooth  ___________________________________has a distinct mesial marginal groove. (Select the correct premolar with this discriptor use the DAQT is required in your answer)  

Life has existed on Earth for NO LONGER THAN 1.2 million years.

The pulp canal:

Any linear elevation on the surface of a tooth is called what?

This tooth _____________________________________ has buccal and lingual cusps that are nearly the same height.  (Select the correct premolar with this discriptor use the DAQT is required in your answer)  

From the incisal view, the ______________________ incisors exhibit the most convexity labially and lingually.

Which of the following best represents a sodium atom?