What fundamental condition for human biology shifts the focus away from environments suitable for simple microbial life?

Answer

The requirement for readily accessible liquid water, moderate temperatures, and a breathable oxygen-nitrogen atmosphere.

Human biology is specifically tuned to Earth-like conditions, necessitating accessible liquid water, moderate temperatures, and a specific atmospheric composition, requirements that simple microbes can bypass.

What fundamental condition for human biology shifts the focus away from environments suitable for simple microbial life?
astronomyexistenceplanetlifeHabitability