Answer: food chain.
- A food chain
- B water cycle
- C life cycle
- D nitrogen cycle
Correct answer: A. food chain
Explanation: A food chain traces the flow of food (energy) from one organism to the next.
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.