it should have floated above Mt Everest. In that height the air becomes thin,
EA: please correct that. when the waters lifted the ark, dung and all, it also lifted the atmosphere. with very nearly the same pressure at that new sea level.
It was the smell in the ark and of the floating bloated rotten corpses that was the problem, not the cold or lack of oxygen.
Food was simple, all passengers on the ark were vegetarians, until the door opened. plenty of carrion around then. but, please no blood.
Abel bsw, offered carrion on his altar too. the dogs and lions would not touch it.