Explain why maternal iodine deficiency might lead to neurological impairment in the fetus. Hypothyroidism and hyperthyroidism

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The answer is overmatching

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