A striking example of ______ is that of a ruminant animal such as a cow and the bacteria that live in its gut:
Correct answer: C. Mutualism
- A. Parasitism
- B. Commensalism
- C. Mutualism
- D. None of these
Explanation
Gut bacteria help cows digest cellulose and obtain food and shelter in return, so both partners benefit. This reciprocal benefit is characteristic of mutualism, not parasitism or commensalism.
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