The largest scientific study of its kind estimates that Earth could play host to more than 1 trillion different species, which means we've probably only identified a vanishingly small proportion of them - only about one-thousandth of 1 percent.
To figure this out, biologists in the US combined more than 35,000 separate analyses of microscopic and non-microscopic species. If the scientists are correct in their estimates, we've got a long way to go before we'll have seen all that Earth has to offer.
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