because it is the only planet that can sustain life.
only earth is a living planet.
Earth
Earth is considered a very special planet, in that it is the only known planet which harbours life.
Earth
Water is necessary for life to exist, and since earth is the only planet known to have liquid water, it is the living planet
Earth is known as the living planet because the conditions required to support life are found only on earth.
Earth is considered "the mother planet."
Because Earth is the only planet known to have life.
Earth or any planet where life is possible
It is not considered a planet, it is a planet, just like Earth, Venus, Neptune (etc).
Bacteria were the first living things on the planet Earth.
earth is considered as a planet because it is a part of solar system