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Who observed that within a region species richness increased with increasing the area explored, but this increase is only up to a limit?

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Who observed that within a region species richness increased with increasing the area explored, but this increase is only up to a limit?

(a) Charles Darwin

(b) Alexander von Humboldt

(c) Rudolf Virchow

(d) Louis Pasteur

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My question is from Patterns of Biodiversity topic in portion Biodiversity and Conservation of Biology – Class 12

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The correct choice is (b) Alexander von Humboldt

Best explanation: Alexander von Humboldt a German naturalist and geographer explored the South American jungles. Through his observations, he concluded that with the increasing explored area, the species diversification increased. But this increase in diversity of species was seen only up to a limit.

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