Up to this point, scientists have officially identified about 1.75 million species of plants, animals, fungi, and microorganisms. And though it’s hard to know just how many remain undiscovered, the UN Global Diversity Assessment has estimated that the total number of species out there may be about 13.6 million. Truly, we have barely even begun to become aware of the diversity supported on this planet. Among the ecosystems most likely to yeild new species as scientists continue to explore them are the tropical rain forests, the ocean depths, and even the internal organisms of many animals – which make a great habitat for previously-unknown microorganisms!
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