How would a tree falling from the overstory layer MOST immediately affect the rounding plants in the other three layers?

The answer is d. when it begins to fall back to the child's hand

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