Right...let's say, for the sake of conversation, that the ark did contain only land-based species.
How would Noah & his helpers keep the animals from fighting & killing each other? It seems like quite a lot to ask an ark full of rhinos, gorillas, ostriches, gila monsters, ocelots, & three-toed sloths to play nicely. And what about the animals that must have been unknown to that region of the world? And how many tons of food would the ark have to hold, not to mention the diversity of each species' diets? How would they have gotten rid of what must have been tons & tons of waste a day?
Science is unnecessary when common sense will do.
Ever heard of Hybernation?
C'mon. You'll have to do better than that.