breathing without oxygen on Mars

[Tales]

An offshoot of my topic.

Recently i found out about this creature who can breathe without oxygen. But the question is what does it eat and what does it breathe?

ScienceShot: Animals That Live Without Oxygen - ScienceNOW

 

[skeptical]

These animals are not well known, and their nutrition is a bit of a mystery. However, they have a gut, and a ring of tentacles, and live in waters teeming with micro-organisms. So what they feed on is probably rather obvious.

They do not use oxygen. Instead, hydrogen is their feed stock, used in their biochemistry to generate energy.

 

[Tales]

But you don't find free hydrogen in those environments huh...

 

[skeptical]

Actually, free hydrogen is quite common, especially in the deep ocean near thermal vents.