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DE SO 4Perhaps the greatest value of biodiversity is yet unknown. Scientists have discovered and named only 1.75 million species — less than 20 percent of those (1)________ to exist. And of those identified, only a (2) ________ has been examined for potential medicinal, agricultural or (3)________ value. Much of Earth's great biodiversity is (4) ________disappearing, even before we know what is missing. Most biologists agree that life on Earth now is (5) ________ with the most severe extinction episode since the event that drove the dinosaurs to (6) _______ 65 million years ago. Species of plants, animals, fungi, and microscopic organisms such as (7)________ are being lost at alarming rates - so many, in fact, that biologists estimate that three (8) ________ go extinct every hour. Scientists around the (9) _________ are cataloging and studying global biodiversity in hopes that they might (10) _______ understand it, or at least slow the rate of loss.

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