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7 April, 09:27

Three billion years ago, Earth's atmosphere was very different. It included the gases methane and ammonia. If scientists found a new planet outside our solar system that had an atmosphere similar to Earth's three billion years ago, what kingdom's organisms would you expect the new planet's organisms to resemble?

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  1. 7 April, 12:27
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    The new plant will be photoplackton or an alien
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