How many biological substrates of life?

2 points by energyscholar ↗ HN
How many biological substrates that support life do we know of? There's our current Chemistry in three dimensions substrate based on carbon. Are there any others? What are some likely prospects?

2 comments

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One (ours), nobody is sure if there are others.

There is some handwriting about others, but I'd ignore them. More linkbait than science.