We don't know that for sure, so any 'explanations' might come back to haunt us in the future as we learn more about distant planets.
Earth is the only planet known to have life and liquid water.
So far the answer is Earth... But we are still looking around...
The only planet that we are aware of is the earth. So far we have discovered no life anywhere else
No the only planet that has life is earth.
The Earth is unique because it is the only planet known to support life.
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 the only planet known to have life and liquid water.
Earth is the only planet which is known to harbour life.
Earth
Our planet, the Earth is the only planet with drinkable water. It is the only planet in our Solar System with life and oxygen. Without the oxygen, there will be no life and water on Earth.
Earth is a are home planet ,and the only planet that contains life
Earth is the only planet currently known to have life.
planet earth is known for being the only planet to 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.
So far the answer is Earth... But we are still looking around...
Earth (obviously).