Porque consideras que la cantidad de oxigeno en la atmosfera primitiva influyo en los primeros organismos

Amillion dollars

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 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.