If you place an organism classified as a photoautotroph at the bottom of a lake and later see that it is able to acquire nutrients from dead plant material, you can conclude the photoautotroph is actually a

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A mixotroph is an organism that can obtain nutrients through both phototrophic and heterotrophic means. In this scenario, the organism was initially classified as a photoautotroph, but is now also obtaining nutrients from dead plant material, indicating that it can also act as a heterotroph. This fits the definition of a mixotroph.

If You Place an Organism Classified as a Photoautotroph at the Bottom