What does a flatworm have in common with a cnidarian?
A. cephalization
B. a well-developed mesoderm
C. a body cavity between the digestive cavity and the body wall
D. a digestive cavity that also distributes nutrients

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

Gay-lussac's law i think.

Sorry i was trying to figure out the answer to your question. but can't sorry