Final answer:
In hazard warning labels, all elements - symbol, words, pictures, and colors - are important in conveying information about the hazards of a particular substance. However, if we were to prioritize, the least important element would be the labels.
Step-by-step explanation:
In hazard warning labels, all elements - symbol, words, pictures, and colors - are important in conveying information about the hazards of a particular substance. However, if we were to prioritize, the least important element would be the labels, as they are simply a way to organize and categorize the information.