Food chains show what in ecosystems?

• A. The feeding relationships in an ecosystem and how energy is passed down
• B. The climate patterns of an ecosystem
• C. The total number of organisms in an ecosystem
• D. The water cycle in an ecosystem

Answer: (A)

Food chains show how energy moves through ecosystems through feeding relationships. They map who eats whom, starting with a primary producer that captures energy from the sun, then herbivores, followed by predators, with energy diminishing at each step as organisms use some for life processes and heat is lost. This flow from producers to consumers explains why energy is released at each transfer and why there are fewer top-level consumers. The other options describe climate patterns, population counts, or the water cycle—things not depicted by food chains.