Which element is not one of the most abundant elements in living organisms?
a. hydrogen
b. zinc
c. oxygen
d. carbon e. nitrogen

Zinc. all the other elements are found in living organisms to a relatively large extent. 

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it