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What is the estimated number of species currently discovered and described on Earth?

Answer and explanation

Correct answer: 1.7–1.8 million

Correct answer: B, about 1.7–1.8 million described species. A described species is one that has been scientifically identified, given a name, and recorded in scientific literature. This number refers to species known to science, not the total number that actually exists on Earth. Many species, especially small organisms and organisms in poorly studied habitats, may still be undiscovered or undescribed. Option A is lower than the standard textbook estimate. Options C and D are larger figures and may relate to estimates of species that could exist, rather than the number already described. Memory cue: for school-level biodiversity questions, connect “described species” with approximately 1.7–1.8 million.

Related tags

Species CountDescribed SpeciesBiodiversityScientific RecordsAnd Classification SystemsBiodiversity And Classification SystemsThe Living WorldBiology

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