Find out the incorrect statement among the following. (1) Alexander von Humboldt observed that w...

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Find out the incorrect statement among the following.
(1) Alexander von Humboldt observed that within a region species richness is proportional to explored area, but only up to a limit.
(2) A stable community should not show too much variation in productivity from year to year.
(3) David Tilman in his short-term ecosystem experiments using outdoor plots found that plots with more species showed less year-to-year variation in total biomass.
(4) Wildlife safari parks are the ex situ approaches towards biodiversity conservation.
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