What is a food chain?

• A. A set of organisms sharing habitat
• B. A cycle of energy that repeats
• C. A single linear pathway showing energy moves from one organism to another
• D. A network of interconnected food chains

Answer: (C)

A food chain shows how energy moves in a straight line from one organism to the next. It begins with sunlight fueling plants, which are eaten by herbivores, then by carnivores, and so on, with energy passing along a single linear pathway. At each step, most energy is lost as heat, so it doesn’t loop back on itself. This is different from a food web, which is a network of many interconnected chains, and from other ideas like organisms sharing a habitat or energy cycling in loops. So a simple linear pathway showing energy moving from one organism to another best captures what a food chain is.