If I remember right I believe the theory is that before the flood there had never been rain and that a mist came from the earth to provide water for life... After flood the climate changed and over time they died out etc.

As for the comment ur refering to at the end of the thing just proof that its either fake or creationist evolutionist view that believes god created using evolution or something like that.

[70 Herald] Cloud the Honorary Librarian
[65 Forest Stalker] Windlass Farshot
[51 Druid] Doesnot Care