The Immune System. Isn't it three food groups? ​Food from animals (lean meat), legumes (peas), and staples (rice, and sweet potatoes) 

Is there any pictures in the question? i can’t answer the question without seeing the model.

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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

Need the answers if its a multiple choice question