Not only would the air have been unpleasant, it would have been lethal.
Well obviously, Jesus, who has always been alive in some form or another, brought Moses and his family advanced air filtration technology from the 24th century, along with wood from the fabled Irontree of Omicron Persei 8.
Actually there is a way of cheating. It is actually easy to have 2 of every kind. Because you only need to have basic spieces. For exampel only 2 kinds of very mixed humans and in a few generations you will get several Under species for humans. There are only abit more than 100 basic spieces. There are millions of ants species. But you only need 2.
This is just a rehashing of the "kind" debate. Please define for us what a "kind" is, and if you can accept rapid speciation within kinds, what mechanism stops speciation into a new kind?
I have no idea what you mean by Under species for humans...do you mean races? Races and species are completely different.