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1£®What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun£®
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2£®How they produced young was generally by laying eggs£®
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3£®The problem was that the earth became violent because¡
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4£®Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved£®
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5£®What scientists think is that the earth was different because of the arrival of small plants growing in the water on its surface£®
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