In addition to carbon, which elements are found in all biological macromolecules? A. nitrogen and oxygen
B. hydrogen and nitrogen
C. calcium and hydrogen
D. hydrogen and oxygen
E. calcium and oxygen

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.

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