The zone which allows the potential for life on Earth is the circumstellar habitable zone.
Explanation:
The circumstellar habitable zone is the zone in which Earth exists. This zone allows the Earth to have or support life on the planet. The habitable zone signifies the presence of support system which could lead to pursue life and that is the presence of water and oxygen.
The water needs to be in ample liquid form with a well defined atmospheric pressure. The presence of zone is circumstellar that is determined by the position of the planet in the Solar System.
