What is a $Keystone$ species?

  • A
    $A$ species that has a high population density in a given ecosystem.
  • B
    $A$ species that has a low population density but plays a critical role in maintaining the structure and function of an ecosystem.
  • C
    $A$ species that has a high population density but has very little ecological significance.
  • D
    Both $A$ and $C$.

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