Biology for IGCSE & O level - Human Influences On Ecosystems (Section 7 - No. 23)
What is a key characteristic of a 'keystone species'?
It is the most abundant species in an ecosystem.
It has a relatively small impact on its environment.
Its presence significantly influences the structure and function of an ecosystem.
It is always a predator.
Explanation
A keystone species has a disproportionately large effect on its environment.
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