What do the letters inside the squares of a Punnett square represent?
O the genotypes of the parent organisms
O the gametes of the parent organisms
the possible genotypes of the offspring
O the possible phenotypes of the offspring

Hydrosphere is the correct answer

The correct answer would be b

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