Choose the correct statements.I) Alexander von Humboldt observed that within a region, species richness increased with explored area up to a limit.II) Paul Ehrlich proposed ‘Rivet popper hypothesis’ to explain the importance of species in the ecosystem.III) David Tilman found that plots with more species showed more year – to

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Choose the correct statements.
I) Alexander von Humboldt observed that within a region, species richness increased with explored area up to a limit.
II) Paul Ehrlich proposed ‘Rivet popper hypothesis’ to explain the importance of species in the ecosystem.
III) David Tilman found that plots with more species showed more year – to – year variation in total biomass.

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I, II

II, III

I, III

I, II, III

answer is A.

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