- 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.
Concept context
Ecosystems, food chains, energy flow, nutrient cycles, biodiversity, and conservation.