What if “alien life” is already here… and we’re standing on it? 👀 Some scientists believe Earth might host a hidden “shadow biosphere” — a second kind of life made of microbes with completely different chemistry from every known plant, animal, and bacterium. Instead of using our familiar DNA-and-protein toolkit, these organisms would run on a different biochemical code, which means our standard lab tests might not detect them at all.​ Clues are strange but real. Researchers have pointed to myst

8.1: Evolution - Patterns in the Biosphere