Sometimes the presence or absence of a particular organism in an ecosystem reflects directly on the health of that ecosystem, sort of like the "canary in the coal mine." What do ecologists call those species?

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The Answer of Sometimes the presence or absence of a particular organism in an ecosystem reflects directly on the health of that ecosystem, sort of like the "canary in the coal mine." What do ecologists call those species?

Sometimes the Presence or Absence of a Particular Organism in an Ecosystem