gram staining help?

[FBR]

Compare the usefulness of classifying bacteria based on shape to classifying them based on gram-stain results.

 

 

I have no idea what i am supposed to write as its not in any of my notes. And ive been searching online for hours. Clearly i dont want anyone to answer the question for me but if its possible for anyone to give me some hints or at least point me in the right direction or something. If so then i thank you in advance and if no one can help me....well im just gonna have to keep searching online til my brain melts