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Earth has considerable amounts of surface water. Surface water is negligible on Mars and the other terrestrial planets, though it appears as though Mars may have had water a few billion years ago.

Earth has free oxygen in its atmosphere, likely as a result of photosynthetic life. That makes earth somewhat unique. This atmosphere is imperative in preventing harmful electromagnetic rays emitted from the Sun from reaching surface creatures in excessive amounts, necessary for the sustenance of life.

Earth is also the correct distance from the Sun so that temperature extremes that prevent life from fostering do not exist.

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