Noah's Flood believers: Where did...?

...Noah and his family and the animals get oxygen to breathe while they were on the ark? It's a well-established fact that the earth's atmosphere has no naturally-occurring free oxygen, all the oxygen we breathe comes from plants converting CO2 to oxygen through photosynthesis. With all the plants on... show more ...Noah and his family and the animals get oxygen to breathe while they were on the ark?
It's a well-established fact that the earth's atmosphere has no naturally-occurring free oxygen, all the oxygen we breathe comes from plants converting CO2 to oxygen through photosynthesis.
With all the plants on earth underwater, there would be little or no photosynthesis, and no free oxygen in the atmosphere. Noah and his family and all the animals on the ark should have died within a couple of weeks from lack of oxygen.
So, how did that work?
Update: Yes, the majority of oxygen is produced by algae and phytoplankton, living things. But the bible says every living thing was wiped out, so no algae nor phytoplankton...
Or is the bible wrong?
Update 2: People in submarines have oxygen generators inside their submarines -- human inventions.
Update 3: They wouldn't have to 'consume' it -- oxygen escapes from the atmosphere very quickly, and as a reactant it oxidizes very quickly. Scientists estimate that without constant generation of new oxygen, our atmosphere wouldn't have enough for *any* human to breathe in 2-3 weeks...
Update 4: The bible says the flood was at least 30 feet over the tops of the highest mountains, so no trees on mountains. And, again it says *every living thing* died, so no algae nor phytoplankton...
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