Genetic equilibrium occurs when A. the number of new alleles equals the number of extinct alleles.
B. there is a high frequency of non-random mating.
C. populations are very small.
D. there is no change in the allele frequencies within a species.

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

Mechanical energy from wind nonrenewable resource