Okay so, the Doctor is from out of space but does he only breathe oxygen like everyone else? Does Gallifrey have an atmosphere like Earth’s? Because I’d never thought about it before now but he seems to be struggling just as much as everyone else and he does seem to have the same basic anatomy as a human, other than the two hearts.
Anyone care to answer?
Gallifrey’s atmosphere is 77% Nitrogen, 21% Oxygen and 2% other, which means that it’s similar to Earth’s atmosphere, but it’s a bit thinner.
The Doctor needs oxygen as well, but Time Lords have a raspiratory bypass system that allows them to go without breathing for a longer time span than humans.
Most fandoms have some pretty deep canon. The Doctor Who fandom can tell you the concentrations of gas in the atmosphere of the home planet of the main character. DW Fandom > Your fandom