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The correct option is E ; A keystone species , A keystone species is important in an ecosystem because it is the species whose presence has an impact on all other species in the ecosystem.
A keystone species is always a dominating predator that feeds on the population of prey. If it is eliminated, the prey population would explode, reducing population diversity. Bison, prairie dog, and so forth.
The term "niche" in ecology refers to the role that an organism plays in a group. A species' niche includes both the physical and environmental characteristics
it demands (such as temperature or topography) as well as its interactions with other species (like predation or competition).
Learn more about to ecological community visit here;
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