what is unique about the earth and its position in the solar system?
It is far enough from the sun to have moisture (seas, precipitation, etc.) but not too far to allow the sunlight and heat to enable animal and plant existence.
Success is measured not by the heights to which one rises, but rather by the obstacles that one has overcome.
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It is the only planet that, as far as we know, has any form of life. Mars may have had life in the past, but that appears to have been extinguished.
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