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This article aims to clarify how many species are on Earth and what information is needed for precise answers.

September 16, 1988Science

How Many Species Are There on Earth?

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This article aims to clarify how many species are on Earth and what information is needed for precise answers.
Survey of current answers regarding species diversity on Earth.
Review of various factors affecting diversity and their roles in food webs and organism abundance.
Analysis of species richness and categories of body size.
Identifies multiple factors influencing species diversity such as food web structure and organism abundance.
Highlights the need for more precise data to understand the prevalence of common and rare species.

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Survey reviews factors determining species diversity, exploring abundance and body size categories in ecosystems.

Robert M. May (1988) studied this question.

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