I've wondered whether life could be restricted to an area say the size of a city park as a very small "favorable condition" region of a planet. Ceres has more s

I've wondered whether life could be restricted to an area say the size of a city park as a very small "favorable condition" region of a planet. Ceres has more surface area than California, Texas, Montana, New Mexico, Arizona, Nevada, and Colorado combined... I'd imagine it'd take a long time for some decent amount of planetary coverage, even if everything happened favourably.