Question

why Earth known as the unique planet​

Answer 1

Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it "blue planet". Because of its water, Earth is home to millions of species of plants and animals.

Answer 2

Answer:

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why earth known as the unique planet

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The earth is called a unique planet because:-

It is the only planet which has favorable conditions that support life.

It is neither too hot nor too cold.