If a pea plant has a genotype SSTt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant? SS, Tt, ST
ST, St, st
SS, Tt, ST, St
ST, St

That is true! many fish species traveled to the u.s. because of it.

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

Vijina kid