Can you guys give me open responses (short answer) question about keystone species and biodiversity that can be used on a quiz and answer the open response question.

Keystone species is a species which has a disproportionately large effect on its natural environment relative to its abundance, a concept introduced in 1969 by the zoologist Robert

Keystone species maintain the local biodiversity of an ecosystem, influencing the abundance and type of other species in a habitat. They are nearly always a critical component of the local food web. ... Without its keystone species, an entire ecosystem would radically change—or cease to exist altogether.

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