its easy to locate ghosts with Terran units but the others dont locate as well
the missile turrets are pretty cheap and quick to build, they have science vessels that detect things and comand center has a scanner sweep wanna play an online match
thats why I like Terran.. they have the best basic unit...Marine - Long Range, can attack air.Zergling - Melee, cant attack air.Zealot - Melee, cant attack air.I lol at the computer playing Terran always making heaps of Firebats instead of marines