How did the number of light and dark colored frogs change over time?
Why did this happen?
What trait was selected for? What tralt was selected against?

Where are they though?

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !

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