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... dely accepted number was proposed by Professor Camilo Mora from the University of Hawaii at Manoa:
8.7 million, excluding viruses.
This number was estimated using the application of biological classification hierarchies—essentially the trends in the number of kingdoms, phyla, classes, orders, families, genera, and species as learned in biology textbooks (org/content/113/21/5970).
For example, a phylum of animals = 10 classes = 100 orders = 1000 families = 10000 genera = 1 ...
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