Answer: producers.
- A producers
- B consumers
- C decomposers
- D predators
Correct answer: A. producers
Explanation: Producers (autotrophs) make their own food by photosynthesis.
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.