I need help, I don’t understand this. But I think it’s a, c, d

It is evolution, because we all have some of the same traits like eye color or shape or ears.

What's the yellow wallpaper?

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