5 Questions
What percentage of Earth's current species have been documented?
13.6%
How are individuals of the piping plover counted?
By census
How many species are estimated to have ever lived on Earth?
5 billion
How many species have been described according to one study?
1,899,587
In what period did approximately 17,000 species get described per year?
2000–2009
Test your knowledge of species populations with this quiz! Explore estimates and census methods used to count individuals in the field of population ecology and biogeography.
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