I think there is too big leap and cross between species that came to earth from another planet long time ago may have occured, that would explain leap from original man, the hunter leading nomadic lifestyle to intelligent, thinking and building cities man. Each topic that is referring to distant times is hard to answer and in my opinion can not be answered with certanity. According to Baba Vanga (which is not among us anymore rest in peace), in our solar system, we are only at level 3 of development, for more than 30 avaible, and also having life on every planet of our system. On Pluto level 7 for example (maybe that's the reason it was excluded from our solar system), and what is very interesting on Mars level of development that allows to merge with God. You will say another false prophet, I will say someone must be wrong, and either it's mars rover or Baba Vanga, and I really really hope it's mars rover    Ofcourse both of them could be wrong, but even if that's the case it's a good lesson of humility - no human on earth have final knowledge I guess, and every human can always be wrong.