Christians I have questions?

How come the animals on Noah's Arc didn't eat each other? If Noah really did take a pair of all the species of animals in the world in a wooden boat how come it didn't sink? And if it was only two kinds of one species of animals, they had to have and then how could of the species survived? Their offspring would have to screw each other which makes an inbred, therefore causing problems in there offspring. PLEASE ANSWER ALL OF THESE QUESTIONS WITHOUT A MAYBE. YOUR ANSWERS MUST COME OUT OF THE BIBLE.