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Pick the answer which best completes the gap/s in clear, accurate English. Nobody knows exactly how many species of living things there are on our planet: estimates suggest, somewhere between 5 and 30 million. But apparently, almost exactly half of the ones that we do know are ... ...

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Pick the answer which best completes the gap/s in clear, accurate English. <br />Nobody knows exactly how many species of living things there are on our planet: estimates suggest, somewhere between 5 and 30 million. But apparently, almost exactly half of the ones that we do know are ... ...





 
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