Philosoraptor

Additionally, all the fish would have died due to the change in PH, so Noah's ark would have to have a giant fish tank on it XD

And the worst part is, even that wouldn't've been enough, because everybody and everything would freeze to death, and those that didn't would suffocate.

sounds unpleasant...

And even if any of the animals made it, there'd be no plant life for the herbivores, then there would be no food for the carnivores , and even if they did kill something for food, they'd make an entire species go extinct.

But eventually, they would've run out, or resorted to cannibalism.