Pyramid of numbers in parasitic food chains inverts due to high parasite abundance

Steps:

• Identify trophic levels: herbivores (elephants, base) support parasites (ticks), which feed birds (oxpeckers), preyed on by raptors (goshawks).
• Estimate organism numbers: few large herbivores, many ticks per host, fewer oxpeckers per tick population, fewest goshawks as top predators.
• Recognize pattern: narrow base (few herbivores), widest at parasites, then tapering upward.
• Match to inverted pyramid showing more organisms at intermediate levels than base or top.

Why C is correct:

• Depicts inverted shape per ecological principle where few hosts sustain abundant parasites, maximizing energy transfer efficiency in the chain.

Why the others are wrong:

• A: Upright pyramid assumes decreasing numbers upward, ignoring high parasite density.
• B: Spindle shape fits balanced ecosystems, not parasitic imbalances.
• D: Fully upright or erratic doesn't reflect host-parasite number dynamics.

Final answer: C