Answer: Soil formation.
- A Recreation and tourism
- B Climate regulation only
- C Soil formation
- D Timber extraction
Correct answer: C. Soil formation
Explanation: In that estimate soil formation accounted for about 50 percent of the value of ecosystem services, far more than recreation or nutrient cycling individually.
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.