Observations: What do you see? Draw a picture of the eggs below and describe them. Why did your teacher add vinegar to the one egg?
Is the Egg bigger or smaller compared to the control?
Why?

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

Yes yes yes very good