Answer:
In ecology, a food chain is a series of organisms that eat one another (so that energy and nutrients flow from one to the next). For example, if you had a hamburger for lunch, you might be part of a food chain that looks like: grass \rightarrow→right arrow cow \rightarrow→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like: lettuce \rightarrow→right arrow human.
