i really wonder how could he feed each animal since each animal has its own unique food, and how could he store these supplies inside the arc without being rotten, where to get fresh water, how could he attend to disposal of waste. Moreover each animal has its own habitat and unique environment, so how could he regulate temperature,humidity etc..? the bible also states that noah took a sample for each kind of animal. this is imposible since there are animals found on other places which are not found in noah's continent. if he was able to circumnavigate the entire globe to get a small sample for each kind, then he will be faced with the problem of logistics to transfer them to the arc.
Remember that every living thing back then were herbivores, so all Noah needed to bring was plants and grass etc. Back then there were only a few 'kinds' of animals within a confined area of the globe (it's only ~1500 years after creation, you know), and all the variety of today comes from them (but no evolution occurred!). Any other questions you may have, are answered by one simple statement: God took care of that.
So there - try to come back with science against that! God can do anything.
Of course - God could have simply put a force field around every living creature he decided to spare, or used a completely different method than a flood, but then Noah wouldn't have been tested, and wouldn't have had much to do with his time.