Answer: Plants and algae (photosynthesizers).
- A Herbivores that consume plants
- B Carnivores that prey on consumers
- C Plants and algae (photosynthesizers)
- D Decomposers breaking down matter
Correct answer: C. Plants and algae (photosynthesizers)
Explanation: Primary producers (autotrophs) like plants and algae produce organic matter from sunlight via photosynthesis, forming the base of food chains.
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.