Hemical compound that can cause algal blooms and cultural eutrophication in streams Answer A: Nitrates ( N O 3 with a negative 1 charge )

Answer B: Chlorofluorocarbons ( C F Cs )

Answer C: Nitrogen oxides ( N O x )

Answer D: Carbon dioxide (CO2)

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

  a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set

Your answer is a because that is true