Identify the correct statement.

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(B) $1$. Tropical regions have higher biodiversity compared to polar regions,making option $A$ incorrect.$2$. Alexander von Humboldt observed that wit

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According to Alexander von Humboldt,species richness increases with increasing explored area,but only up to a limit.

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(B) $1$. Tropical regions have higher biodiversity compared to polar regions,making option $A$ incorrect.$2$. Alexander von Humboldt observed that within a region,species richness increases with increasing explored area,but only up to a limit. This is the correct statement (option $B$).$3$. David Tilman's long-term ecosystem experiments showed that increased diversity contributes to higher productivity,making option $C$ incorrect.$4$. Tilman also found that plots with more species showed less year-to-year variation in total biomass,making option $D$ incorrect.

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