Science Mysteries: How Many Species Are There?
You might think that after 200 years, the scientists who find, name, and describe Earth's species would be close to finished. But taxonomists, as organized as they may be, have no idea how many species Earth has. Nor can they even provide an educated guess. Although reporting over 16,000 new species every year, taxonomists still cannot predict how many more are undiscovered.
In total, taxonomists have categorized and listed 1.2 million species on Earth. At this point, you would think scientists should be able to use the information they have gathered to make good predictions about how many species an ecosystem can support. This would help them make better predictions about how many species are left to identify. So far, however, the guesses seem to vary so greatly that it seems there is no good theory for making a prediction.
One of the main problems is that most of the places that seem to have a lot of diverse species are in places that are hard to get to. One such place is the ocean, where scientists believe some 80 percent of Earth's creatures are hiding at depths too deep for us to study. In addition, many of the planet's most diverse areas are in remote places with few taxonomists.
Despite all the unknowns, scientists have agreed that there are between five and 15 million species left to discover on Earth. This is a huge range, but whether it's five or 15, taxonomists clearly still have a lot of work to do. And who knows, there may yet be a dragon or a Loch Ness monster left to discover.
Which of the following best paraphrases the paragraph in bold?
Scientists aren't totally sure, but dragons and the Loch Ness monster could actually be real.
Scientists believe that there are between five and 15 million species that they have not yet classified.
There are a lot of unlabeled species out there, and science is full of surprises.
There are many things they're not sure of, but scientists agree that there are very many species they don't yet know about. It's a wide range and a lot of work, but there could be scientific proof that even dragons are real.
