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Energy flow within a food chain begins with green plants, which serve as the initial source of energy. These organisms represent which trophic level?

1. First level producers
2. Second level consumers
3. Third level consumers
4. First level consumers

Correct answer: First level producers

Solution

Green plants are autotrophs, so they produce their own food using sunlight. Because they start the energy flow in a food chain, they are the first trophic level and are called producers.

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