What is a threat to biodiversity? A:Rapid ecosystem change

B:All of the above and below

C:Global warming

D:Habitat loss

This movement is also referred to as  glacial plucking

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