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If the probability of flipping a coin and getting heads is 1/2, then the probability of flipping the coin twice in a row and getting heads both times is (1/2)^2 = 1/4 and the probability off getting heads three times in a row is (1/2)^3 = 1/8 and so on. Similarly, if after the first living organism sprang into life and the probability of it surviving one mutation was 99/100, then the probability of it surviving the first 1000 mutations would be (99/100)^1000 = 0.000043171. If the earth didn't have an ozone layer, life would have evolved on earth to cope with that condition and the same would be true if there were no radiation belts to filter out the harmful charged particles from the sun etc. So you see, the complex life and ecosystem that has evolved on earth is not really as miraculous as some would have you believe and given enough time such life will evolve on every planet, moon and desolate place.
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