Hypothetical types of biochemistry

Several forms of biochemistry are agreed to be scientifically viable, but are not proven to exist at this time. The kinds of living organisms known on Earth, as of 2026, all use carbon compounds for basic structural and metabolic functions, water as a solvent, and deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) to define and control their form.

Source: Wikipedia — Hypothetical types of biochemistry (CC BY-SA 4.0)