At present, Earth is the only such planet known.
lifethat it is the only planet in the solar system that supports living things and organisms
It is one of a few that are able to support living organisms.
The only planet that we are aware of is the earth. So far we have discovered no life anywhere else
No only living organisms have cells. But non-living organisms are made up of atoms instead.
So far as we know, only Earth has living organisms. There is strong evidence (some from the Cassini probe) for liquid oceans in moons of Saturn and Jupiter, such as Enceladus, Titan, and Europa; and speculation that these may host life.
One view The Earth can be classified as a habitable planet (and it is the only one we presently know of). Another view A rocky planet characterised by the presence of liquid water and a chemically far-from-equilibrium atmosphere generated by the living organisms that populate its surface.
unicellular organisms
It means A tiny living thing.
All life (living organisms) on the planet Earth contain DNA. It is in fact one of the defining characteristics of life.
earth is the only living planet and one of the terrestrial planets
Yes , bacteria , protozoa and many algae contain only one cell .
All animals are organisms. An organism is anything living that is made of at least one cell. The smallest being... "single-cell organisms" these contain only one cell and are microscopic.