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It was plants. Plants used photosynthesis, basically the sun's energy. And other animals ate the plants, and other animals ate the animals that ate the plant.
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Producers are organisms who make (or produce) their own food. Plants are producers. Plants are autotrophic, meaning that they self-feed through the process of photosynthesis. Without plants in the food chain creating energy from a non-living source (the sun) the rest of the food chain would not exist

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