numbers are estimates; figures from different authors vary wildly, not least because some are based on described species, and some on extrapolations to numbers of undescribed species. For instance, around 25,000-27,000 species of nematodes have been described, while published estimates of the total number of nematode species include 10,000-20,000; 500,000; 10 million; and 100 million.

Plants

The kingdom Plantae is defined in various ways by different biologists (see Current definitions of Plantae).

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