Answer: Increasing concentration of toxins at each higher trophic level.
- A Organisms gradually getting physically larger at higher trophic levels over generations
- B Increasing concentration of toxins at each higher trophic level
- C Increasing biodiversity observed gradually with rising altitude in mountain ecosystems
- D Greater available energy concentrated specifically at the top of the energy pyramid
Correct answer: B. Increasing concentration of toxins at each higher trophic level
Explanation: Biomagnification: concentration of toxins (DDT, heavy metals) increases at each trophic level because animals eat many organisms from the level below.
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.