Each level of organization in an ecosystem is made up of parts. Which of the following is an example of the population level of organization in a coral reef ecosystem? A. seawater
B. a clownfish
C. a group of anemones
D. a colony of coral and a stand of seagrass

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

The answer is b, as with an inference you make a statement with no evidence