A protozoan and its resident bacteria invade the body of a worm. The bacteria release toxins and exoenzymes that immobilize and digest the worm, and the protozoan and bacteria absorb the nutrients produced. The relationship between the protozoan and the bacteria would best be described as

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The relationship between the protozoan and the bacteria is mutualism because both organisms benefit from the association; the bacteria help digest the worm, and both the protozoan and bacteria absorb the nutrients.

A Protozoan and Its Resident Bacteria Invade the Body of a Worm