How is Earth unique?

All of the above

Explanation:

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 the blue planet. Because of its water, Earth is home to millions of species of plants and animals

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i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )