What is an autotroph?

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Autotrophs are organisms that make their own organic matter from inorganic inputs, using energy to drive the synthesis. The sun-powered form is photosynthesis, where light energy drives the conversion of carbon dioxide and water into glucose and oxygen, making these organisms the base of most ecosystems. This self-sustaining production distinguishes them from organisms that must obtain organic material by consuming other organisms. Plants, algae, and many bacteria are classic examples. Some autotrophs use chemical energy instead of light, but when we talk about using the Sun, we’re referring to the common photosynthetic producers.