Question

What are keystone species?
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1 point
The most abundant species in an ecosystem
Species that have a disproportionately large impact on their ecosystem
Always predators
Species with no predators

Answer 1

Keystone species are defined as species that have a disproportionately large impact on their ecosystem relative to their abundance. Therefore, the correct answer is:

**Species that have a disproportionately large impact on their ecosystem.**