[Strategia_In_Ultima]

The African proto-human natives were dying out at the time. The Golgafrinchans weren't part of the supercomputer, but I believe that over time we became a part of the computation, or at least partially. This is evidenced by Arthur Dent's creating part of the Question on the planet with self-made Scrabble tiles he was using to try to teach the natives language. Also, before Arthur and Ford got stuck on the Ark, Marvin said he saw the Question printed in Arthur's brainwave pattern.