it was either mars or earth i think it was mars
dinosaurs were the first creatures to be on this planet.
Because it is the only planet with which we have first hand experience.
Planet earth is the only planet that we know of that has life on it.
Earth- We are the only planet that can support life.
Earth is called a life sustaining planet because it has life on it, and is currently the only known planet that supports life.
well it all begins with water with out it our planet would be useless no life it is very complercated but u will learn about it. also the first life on earth was germs.
Earth is a are home planet ,and the only planet that contains life
planet earth is known for being the only planet to support life
All planets other than Earth could be considered alien. Earth is the only planet known to harbor life.
Earth is the only planet currently known to have life.
So far the answer is Earth... But we are still looking around...
Earth