Biology for IGCSE & O level - Human Influences On Ecosystems (Section 5 - No. 44)
What is a 'keystone species'?
A species with a small population size.
A species that has a limited impact on its environment.
A species that is not essential to the ecosystem.
A species that has a disproportionately large impact on its ecosystem.
Explanation
Keystone species play a crucial role in their ecosystems.
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