Final answer:
An autotroph is an organism that can produce its own food using sunlight or inorganic substances. Phytoplankton is one example of an autotroph, as they carry out photosynthesis to create their own food.
Step-by-step explanation:
An autotroph is an organism that can produce its own food using sunlight or inorganic substances. One example of an autotroph is phytoplankton, which are microscopic marine plants that carry out photosynthesis. These organisms convert sunlight energy into chemical energy, producing their own food.
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