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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ACharles Darwin

BAlexander von Humboldt

CRudolf Virchow

DLouis Pasteur

Answer:

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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