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An autotroph is any organism that produces its own food. This is very rarely seen in animals, but is almost always seen in plants. In most cases algae is a plant, but in some cases it is also a type of bacteria. The bacteria are not auto-trophic, but they can be in some cases.

MOST of the algae you will see in an aquarium or pond though is an actual plant, and the green color of plants is due to their cells containing "chlorophyll". Chlorophyll is used by plant life to convert sunlight and Carbon Dioxide (CO2) into food and Oxygen (O2). So this would make MOST algae you see an autotroph.

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Is algae a photoautotrophs?

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Autotrophs that utilize light as their energy source are?

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What is the main pigment of photoautotrophs?

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Organisms that derive their energy from sunlight are referred to as?

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