Primarily, failure to warn is used in reference to:

At normal ambient temperatures, materials can burn at oxygen concentrations as low as:

A. 2 percent. B. 6 percent. C. 10 percent. D. 14 percent.

The A of the ABCDE rule used in evaluating melanoma is for ________. The mole should look equal in size from side to side. 

Fill in the blank(s) with the appropriate word(s).