A keystone is a wedge-shaped stone that is inserted into the top of an arch made of stacked stones and bricks, fixing the entire arch. Keystone species and. 1: What are keystone species? Predators that are at the top of the food web in an ecosystem and have a major impact on the lives of other organisms are called keystone species. Keystone species, or keystone species, are species that have a relatively small amount of biomass in an ecosystem, but that have a large impact on the ecosystem.
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