Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: A food chain represents a single pathway by which energy and matter flow through an ecosystem. An example is shown in Figure below . Food chains are generally simpler than what really happens in nature. Most organisms consumeand are consumed bymore than one species. Answer: food chain
Output:
A single, often oversimplified, path through which energy and matter flow through an ecosystem is also known as what?