Which of the following is the most appropriate definition?

  • A
    Commensalism is an interaction in which one species benefits and the other is neither harmed nor benefited.
  • B
    $A$ predator is an organism that catches and kills another organism for food.
  • C
    Parasitism is a relationship where an organism always lives inside the body of another organism and kills it.
  • D
    $A$ host is an organism that provides food to another organism.

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