Pyramid of numbers reflects organism counts per trophic level

Steps:

• Identify producers, primary consumers, secondary consumers, and top predators in the food web.
• Count organisms at each level: producers (most), then fewer herbivores, even fewer carnivores.
• Match counts to pyramid shapes: upright with widest base for producers.
• Select the diagram showing decreasing numbers upward.

Why A is correct:

• It depicts an upright pyramid with the highest number of producers at the base, aligning with the ecological principle that energy transfer limits population sizes at higher trophic levels.

Why the others are wrong:

• B shows an inverted pyramid, which misrepresents the food web's decreasing organism counts.
• C represents biomass, not numbers, ignoring individual organism counts.
• D has incorrect counts, with more consumers than producers at the base.

Final answer: A