Concept:Nutrient acquisition modes must match the organism’s actual feeding behaviour.
Explanation:I. Sundew is a carnivorous, photosynthetic plant, not a parasite.
II. Amoeba engulfs food particles, so it is heterotrophic, not autotrophic.
III. Algae make their own food by photosynthesis, so they are autotrophic, not saprophytic.
IV. Agama lizards eat insects and other animals, so their mode of nutrition is heterotrophic.
Hence, only pairing IV is correct.
Answer:C. IV