Discuss how the deer in a forest habitat may act to increase variation in some plant species while causing extinction of other plant species. what conclusions can be drawn about the effect of variation on the survival and fitness of a population?

A deer eats certain plants, but if there is variation, it may like certain plants more than others. The deer may be causing extinction to those certain plants because of eating to much of it. The variation effects the survival of a species because of its unique characteristics called adaptations within the species. If there was a change in an environment, you have a greater chance of survival. Take the deer example. If they had stayed the same, all of that species could have survived because the deer did not eat it, or all of it could have not survived if a new organism changed the environment and ate it. However, with variation only a few of that species may die.

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