It would have to be Io, Titan, and Europa. These are moons though, not planets.
Earth.
Mars.
MARS.
MARS.
So far the answer is Earth... But we are still looking around...
Earth.
Mars.
Mars
MARS.
MARS.
Possibly, but the new planet will not have any life forms. (Most likely.)
Pluto
Earth is the planet with the most life forms.
if our planet Earth had a larger orbit than it does today, the temperature would be dramatically different and most life on the planet would most likely die out from the extreme cold.
the planet that has NO rock on it, is most likely Jupiter.
So far the answer is Earth... But we are still looking around...
Mars