Although the Earth was created about 4.5 billion years ago, life began to exist much later. Because of the large time spans involved, there is inconclusive evidence for exact dates, but even so, the existence of life was evident from the very beginning.
Our Solar System was still young, and the Sun was still cooling down after its creation billions of years beforehand. The unique circumstances of our Solar System and our planet gave rise to life. This was due to a number of characteristics that are exhibited by our ecosphere, the area of a planet capable of sustaining life.
Venus, one of our planetary neighbors, is closer to the sun, with the planet exhibiting characteristics that would not be able to support life. On the other hand, Mars is further away from the Sun, and too cold to naturally support life. However, with manipulation by man, via terraforming, Mars could indeed support life in its present state.
However, Earth, for billions of years, has possessed all the materials and suitable conditions for supporting life.
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