Identify the interaction used to describe each type of interdependence among organisms. The red-billed oxpecker (a bird) eats ticks off the fur of an impala (a type of antelope). The oxpecker receives food and removes the ticks from the impala.

Mutualism is an interaction in which both organisms benefit. The oxpecker gets food by eating the ticks, and the impala benefits because ticks are removed from its fur. Therefore, the relationship is mutualism, choice C.

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