[nine_k]

Oceanic hydrothermal vents teem with anaerobic life which uses a lot of interesting chemistries instead, e.g. based on sulfur.

[tivert]

> Oceanic hydrothermal vents teem with anaerobic life which uses a lot of interesting chemistries instead, e.g. based on sulfur.

Yeah, but none of that anaerobic life is "multicellular life with energy-intensive things like muscles and complex brains." It's all bottom of the food chain bacteria.

[nine_k]

Technically anaerobic multicellular life exists [1], but it definitely not comparable with aerobic forms.

[1]: https://en.m.wikipedia.org/wiki/Anaerobic_organism#Multicell...