<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.kwa mda mrefu babu wa binadamu aliyefahamika alidhaniwa kua aina kutoka nyani, wanaodhaniwa kua waliishi miaka milioni 1.8 iliyopita wakijulikana kama homo erectus.  <response>: for a long time the oldest known human ancestor was thought to be a primitive species, dating back 1.8 million years ago called homo erectus. 