Although the first humans came to Australia 56, 000 years ago and undoubtedly brought new diseases with them, human-borne diseases probably did not cause the mass extinction of large land animals and birds that took place over the following 10, 000 years
After all, more than 55 different species disappeared at about the same time, and no one disease, however virulent, could be fatal to animals across that many different species
Even though I can fix some things and you can fix some things, the two of us will be unable to repair our apartment without outside help. The apartment has both a broken window and a broken bedroom door, and neither of us is able to fix both doors and windows.