Question 11 Which often live on decaying leaves in a forest?
C. sarcodines
B. diatoms
D. slime molds
A dinoflagellat

D.) slime molds.
Slime molds live freely as single cells. But also when together they form multicolored structures. Which you see on decaying leaves.

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