What type of diagram represents the relative number of organisms at each level in a food chain?

The correct choice represents the relative number of organisms at each level in a food chain is the pyramid of numbers. This type of diagram visually conveys how many individual organisms are found at each trophic level, providing insight into the population dynamics within an ecosystem.

In a pyramid of numbers, the base typically shows the largest number of producers (e.g., plants), which support a smaller number of primary consumers (e.g., herbivores), and even fewer secondary consumers (e.g., carnivores). This reflects the energy transfer and ecological interactions where each trophic level supports the next one above it.

This approach does not account for the total mass of organisms (which would be represented by the pyramid of biomass) or the energy content (indicated by the pyramid of energy). Additionally, the concept of diversity relates to the variety of species within an ecosystem, which is not specifically illustrated through the numbers of organisms at each level.