Answer: sun.
- A sun
- B soil
- C wind
- D moon
Correct answer: A. sun
Explanation: Sunlight is the primary energy source captured by producers.
Energy pyramid showing a simple food chain (producer to herbivore to carnivore) with energy decreasing roughly tenfold at each trophic level.
Concept context
Ecosystems, food chains, energy flow, nutrient cycles, biodiversity, and conservation.