That's too easy; Earth is the only planet KNOWN to support life. Life maybe possible elsewhere, but nobody is certain.
The Earth is sometimes called the "Blue Planet" or "Water Planet" because it is the only known planet that has large amounts of liquid water. Water bridges the gap to life, so water makes it possible for the Earth to support life.
Mars.
Europa has large amounts of frozen water. heather Danielle
Earth.
because there are aliens on the planet mercury that are mutated due to the large amounts of the metal mercury.
he was known for his support of large marge
Mars is viewed as the red planet because of the large amounts of iron oxide on the surface
Saturn?
Actually the Great Red Spot is on a planet not a planet its self . It is on the planet Jupiter.
saturn
Earth is the only planet with a bountiful supply of water.
Mars has small traces of liquid water on the planet, large amounts of vapour in the thin atmosphere and huge amounts of ice