I have been trying to increase oxygen transport in my body, kinda similar to what David Blaine did, it's associated with the p21 receptor. Some tube worms use sulphur from bacteria, hell that's a major way I increase oxygen transport, but in terms of other forms of life I think that far surpasses conditions that allow us to live. The plants dominated the land before animals were able too, but I mean whales don't even need to use respiration as often as most species do. Many animals can somehow breathe from their anus, but what I don't quite understand is that animals couldn't form using some type of cavity that utilizes bacteria for cellular respiration as a whole, I mean most animals don't even breathe air but we kinda define the ability of harboring life in that way. Like you could have these really powerful cilia structures in a cavity like organ that could allow animals to breathe theoretically.

Nuh uh