"<a href=""https://www.youtube.com/watch?v=-jA2ABHBc6Y&amp;t=27m48s"">27:48</a> Didn't NASA once find an organism in a lake here on earth 🌎 that can ingest arsenic. In theory", life would have figured out a way to make use of a combination of different elements and not just Oxygen. Unless there is a very strange and unique interplay and as it relates to cellular biology and the role that Oxygenation plays .,(reply>), @Zeb thank you for sharing! So something about carbon atoms and how it binds to other elements.,(reply>), @WookDizz18 Not almonds ?,(reply>), It’s because there are finite elements in the universe, and they occur in every galaxy. Combining carbon and oxygen gives a huge amount of energy output, owing to the arrangement of electrons in the shells of these elements. Add to this the fact carbon is a superb structural molecule, the way it bonds with hydrogen/oxygen/nitrogen makes it astoundingly versatile in forming organic structures. Silicon is a possible alternative, but it doesn’t have the same potential. So it’s a pretty good bet that Oxygen and Carbon will be involved in life elsewhere, there may also be other systems, but we have to go from what we know.,(reply>), The making of this comment, ought not to suggest that life is something that can only be biological.