Which of the following could qualify as a top-down control on a grassland community? a) limitation of plant biomass by rainfall amount b) influence of temperature on competition among plants c) influence of soil nutrients on the abundance of grasses versus wildflowers d) effect of grazing intensity by bison on plant species diversity e) effect of humidity on plant growth rates

The effect of grazing intensity by bison on plant species diversity could qualify as a top-down control on a grassland community (Option D).

In conclusion, the effect of grazing intensity by bison on plant species diversity could qualify as a top-down control on a grassland community (Option D).

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According to the top down control, each trophic level is controlled by the very next trophic level. It says that predators control the population of prey.

Therefor the correct answer is D

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