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Which of the following is an example of a heterotroph?

  1. Fungus

  2. Algae

  3. Plant

  4. Bacterium

The correct answer is: Fungus

A heterotroph is an organism that obtains energy and nutrients by consuming other organisms. Fungus is the only option that fits this definition, as it is not capable of producing its own food through photosynthesis (like algae and plants) or obtaining nutrients through absorption (like bacteria). Therefore, fungus is the only example of a heterotroph in this list.