Genesis 7

[1] And the LORD said unto Noah, Come thou and all thy house into the ark; for thee have I seen righteous before me in this generation.
[2] Of every clean beast thou shalt take to thee by sevens, the male and his female: and of beasts that are not clean by two, the male and his female.
[3] Of fowls also of the air by sevens, the male and the female; to keep seed alive upon the face of all the earth.
[4] For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth.
[5] And Noah did according unto all that the LORD commanded him.
[6] And Noah was six hundred years old when the flood of waters was upon the earth.
[7] And Noah went in, and his sons, and his wife, and his sons' wives with him, into the ark, because of the waters of the flood.
[8] Of clean beasts, and of beasts that are not clean, and of fowls, and of every thing that creepeth upon the earth,
[9] There went in two and two unto Noah into the ark, the male and the female, as God had commanded Noah.
[10] And it came to pass after seven days, that the waters of the flood were upon the earth.
[11] In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.
[12] And the rain was upon the earth forty days and forty nights.
[13] In the selfsame day entered Noah, and Shem, and Ham, and Japheth, the sons of Noah, and Noah's wife, and the three wives of his sons with them, into the ark;
[14] They, and every beast after his kind, and all the cattle after their kind, and every creeping thing that creepeth upon the earth after his kind, and every fowl after his kind, every bird of every sort.
[15] And they went in unto Noah into the ark, two and two of all flesh, wherein is the breath of life.
[16] And they that went in, went in male and female of all flesh, as God had commanded him: and the LORD shut him in.
[17] And the flood was forty days upon the earth; and the waters increased, and bare up the ark, and it was lift up above the earth.
[18] And the waters prevailed, and were increased greatly upon the earth; and the ark went upon the face of the waters.
[19] And the waters prevailed exceedingly upon the earth; and all the high hills, that were under the whole heaven, were covered.
[20] Fifteen cubits upward did the waters prevail; and the mountains were covered.
[21] And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man:
[22] All in whose nostrils was the breath of life, of all that was in the dry land, died.
[23] And every living substance was destroyed which was upon the face of the ground, both man, and cattle, and the creeping things, and the fowl of the heaven; and they were destroyed from the earth: and Noah only remained alive, and they that were with him in the ark.
[24] And the waters prevailed upon the earth an hundred and fifty days.
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I'm going to gloss over the "clean beasts" part. What constitutes "clean" and "unclean" comes later, in Leviticus.
First, let's focus on the animals on the ark. Ken Ham, who recently debated Bill Nye on national television, has an article posted on his Answers in Genesis site regarding how the animals fit on the ark. It's relevant here to go through his article, which is a best-case scenario, and see where the problems in it lie. We could go with reality all day and point out that the fossil record shows every indication that life now is pretty similar to life when the flood allegedly happened (with several extinctions), and we can point out that we find actual bones--actual DNA--from animals living at that time, rather than fossilized remains, because the replacement of bone with minerals takes much longer than a few thousand years. However, since Ken Ham would like his views taught in our schools, and he certainly approves of home-schoolers teaching it to their children, not to mention he gives seminars on it himself and has even set up creation museums to misinform the public, we'll go with his story and shoot it full of holes.
The AIG site ( http://www.answersingenesis.org/articles/nab3/how-could-animals-fit-on-ark ) begins with the notion that only "landbreathing vertebrate animals", including "modern birds, mammals, and reptiles" were on the ark. No insects, arachnids, worms, or fish. No plants. No sea-dwelling mammals. No amphibians. Never mind that a global flood would wipe out all of these.
Research creationists call "baraminological" tells them that the animals on the ark numbered 16,000, and were at the "family level" of taxonomy. This notion, of course, is pure speculation, based on no science whatsoever. Species are species, and the big, gaping hole in this argument is that it's supported nowhere in the fossil record. Nowhere does any evidence exist in the geological column to support the notion that 16,000 "created kinds" existed at the same time, and nothing else. There is no major extinction event at the time the flood supposedly happened, either.
The space required for all of the animals, along with their food requirements, waste disposal, and ventilation are all the subject of Ken Ham's speculation--and that's just it. Ken Ham is speculating. Until he can build a working, floating model of an ark, this boat doesn't float, literally or proverbially. Until he can find evidence to support his claim that everything was wiped out at once except for 16,000 (approximately) creatures (8000 species, not counting the "clean beasts"). The article contains no evidence, but a lot of "could haves" and "might haves". It's a pure guess.
So the animals are on the ark in our myth, along with Noah and his family. Noah is 600 years old (!). Apparently, in all that time, he only had three sons, and the Bible does not mention any other generations of children, so we can only speculate whether the descendants of Noah living at the time, if any, were killed in the flood.
The rain begins, and it doesn't stop for forty days and forty nights. In that time--according to biblical literalists--it covers the entire planet, to a depth greater than the highest mountain (Everest). The amount of rain that had to fall in order for the entire Earth to be covered would have required a downpour equivalent water pressure mining pick, and would have destroyed the ark, assuming, of course, that a wooden boat of its dimensions could float at all, which it wouldn't.
The flood myth isn't over at this point, but since I mentioned Ken Ham's article, I should note that he believes that meat eaters would have eaten the corpses of all the animals that died in the flood. Apparently, nobody has shown him what happens to a corpse that remains in water for too long. Here is a great article that effectively debunks that notion:http://www.scientificamerican.com/blog/post/how-long-do-dead-bodies-remain-inta-2009-06-10/?id=how-long-do-dead-bodies-remain-inta-2009-06-10
It's crazy to believe that there would be any meat left after 190 days (40 for the rain and 150 additional days that the water prevailed on the earth before the waters receded--where to is anyone's guess).