as far as we know it is the only planet that has water and life
Because it can support life, and there have been few other discovered planets that have the ideal conditions to support life.
mars
The most common unique about earth to other planets is that Earth have life.
Hydrosphere.
no
Hydrosphere.
it is unique because we can drink from it
because the earth contains soil
Earth is the only planet known to have life on it.
Terrestrial type planets
Earth is unique in having liquid water at its surface.
Just the one - called Earth
Uranus and Neptune are called the sister planets