Question

Earth is the only planet known to have _____.

Answer 1

A biosphere because earth is the only planet to have living organism. No other planet is known to contain life.

Answer 2

Earth is the third planet in close proximity to the sun. It is the home of majority of organisms in the world.

It is a special planet and it is the only planet to have an atmosphere which contains free oxygen, water bodies on its surface and most importantly life.