What defines an auxotroph?

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A mutant organism that cannot produce one or more necessary nutrients on its ownA plant capable of producing its own carbohydratesAn organism that relies on others to fulfill its nutritional needsNone of the above

Explanation

An auxotroph is a mutant organism that has lost the ability to synthesize one or more essential nutrients required for its growth. This distinguishes it from organisms that can produce all necessary nutrients independently or those that depend entirely on others for nutrition.