Moderate

Commensalism is:

Correct answer: C. When weaker partner is benefited and the stronger is unharmed

  • A. When both partners are harmed
  • B. When both partners are benefited
  • C. When weaker partner is benefited and the stronger is unharmed
  • D. None of these

Explanation

Commensalism is a +/0 relationship: one organism benefits while the other is neither helped nor harmed. This distinguishes it from mutualism, where both partners benefit, and parasitism, where one is harmed.

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