A model most often used to represent the feeding relationships in an ecosystem because there are many pathways, it shows a complex flow of energy through an ecosystem.

• A. Food chain
• B. Trophic level
• C. Detritovore
• D. Food web

Answer: (D)

The main concept is that ecosystems feature many feeding pathways, so we use a food web to represent the interconnected links among producers, consumers, and decomposers that together show the complex flow of energy. A food chain only follows a single line of transfer, which misses alternative prey choices and detrital pathways. A trophic level is simply a position in the food chain, not a network model, and a detritovore describes organisms feeding on dead matter, which is part of the web but doesn’t alone capture all connections. Thus the food web is the model that best represents the multiple pathways of energy flow in an ecosystem.