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"Which scenarios describe a keystone species?
A. Removal of a species of herbivore results in a slight decline in the biomass of the other species in that community.
B. Humans hunt a rare species of predator to extinction. Within several years, the diversity of species living within that ecosystem collapses and only a handful of species remain.
C. On one side of a river, a species of herbivore is found in small numbers. On the other side, it is absent. The side it is found on has 5 times the species diversity compared to the other side.
D. A tree is found to be the most abundant species in a community. Its removal substantially reduces the biomass but not the number of species in the community."

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