Final answer:
An autotroph is an organism that can produce its own food using energy from the environment. Producers, such as plants and some bacteria, are examples of autotrophs. Consumers, carnivores, and herbivores are not autotrophs as they obtain energy by consuming other organisms.
Step-by-step explanation:
An autotroph is an organism that can produce its own food using energy from the environment. In other words, it can convert sunlight or inorganic compounds into organic compounds through a process called photosynthesis or chemosynthesis.
Out of the given options, a producer is an example of an autotroph. Producers, such as plants and some bacteria, are able to make their own food using the energy from the sun or from chemical reactions.
In contrast, consumers, carnivores, and herbivores are not autotrophs because they obtain their energy by consuming other organisms.
Learn more about Autotrophs