An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. It feeds itself, without the assistance of any other organisms. The word “autotroph” comes from the root words “auto” for “self” and “troph” for “food.” Because autotrophs produce their own food, they are sometimes called producers. Algae, along with plants and some bacteria and fungi, are autotrophs.

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