Answer: Variety of living organisms on Earth (genes, species, ecosystems).
- A Total number of individual trees growing in a forest
- B Variety of living organisms on Earth (genes, species, ecosystems)
- C Number of officially listed endangered species in a region
- D Total percentage of land area covered by forest canopy
Correct answer: B. Variety of living organisms on Earth (genes, species, ecosystems)
Explanation: Biodiversity = variety of life at genetic, species, and ecosystem levels. High biodiversity indicates a healthy ecosystem.
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.