Answer: Humus.
- A Detritus
- B Humus
- C Litter
- D Plankton
Correct answer: B. Humus
Explanation: Humification produces humus, a dark, amorphous, colloidal substance that resists decomposition and acts as a reservoir of nutrients.
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.