With specific reference to hermatypic and
ahermatypic corals, explain which type you think is
most commonly harvested and 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

Carbon dioxide is the correct answer

It has been around since 1858 so b. false