Question

State whether the following sentences are always true, false or ambiguous. Justify your answer.
The earth is the only planet where life exist.

Answer 1

True

Earth is unique in the Solar System as being the only planet which is able to support life in all its forms: from basic living micro-organisms to highly sophisticated and intelligent human beings. There are many reasons why this happens.

Earth has a breathable atmosphere. Oxygen is the gas that is required for the life of most creatures. This is present in Earth's atmosphere and also in water. Oxygen is constantly put into the atmosphere by plants and trees. Then earth is the only planet where life exist.