The flood wiped out every living non-aquatic creature on Earth, except for Noah, his family, and every KIND of animal brought upon the ark.
- The animals were brought there by supernatural means
- You did not have to bring adult animals, you could have juvenile elephants instead of adult
- You did not have to bring literally every animal, just every KIND
Noah's Ark was physically possible.
God gave people different languages and spread them out accross the Earth in 2242 BC with the Tower of Babel event.
Presumably he created all the different races and more variations of animals in this same process.
Natural selection does exist, micro-evolution can readily be proven. Macro-evolution has absolutely no proof though.
Dog breeding can intentionally breed certain genetic mutations, this is the same process that is supposed to fuel macro evolution. Just because you can breed bulldogs due to a genetic mutation which causes them to have a flat nose, doesn't mean you will ever turn it into anything but a dog, it doesn't mean it is possible to make it become an aquatic reptile through the same process, if just given enough time.
There is absolutely no proof that the process could turn a single-celled organism into a human, or form irreducibly complex creatures, or form sexual organs from asexual creatures.
Anyway.
The flood was a massive event that reshaped the geological formation of the Earth, and created millions of fossils. (Fossils have to form by being rapidly buried)
Geological formations like the Grand Canyon can be rapidly formed through catastrophic events.
Pic related was formed by a flood in 2002.
en.wikipedia.org/wiki/Canyon_Lake_Gorge
Attached: canyon lake gorge.jpg (572x409, 64K)