Earth is our only example of a habitable planet. The surface of Earth is 29% land and 71% ocean. I am wondering what other land ratios can create a habitable planet.
Half a billion years ago, Earth had little land and was covered in ocean. Yet, even back then Earth had life. So it is definitely possible for a habitable planet to have a surface that is 100% ocean and 0% land. I'm not sure if it is possible to have a life-bearing planet that is 100% land and 0% ocean though.
What is the maximum amount of land (ratio-wise) that a natural planet can have that humans can still live on? Assume the mass, volume, and distance from a main sequence star is the same as Earth.