Dylan drew a diagram showing that certain organisms eat other organisms. The diagram included a caption stating that the amount of available energy decreases with each organism that is eaten. How is this explained by the law of conservation of energy? A. Living things change energy into matter. B. Some of the energy is used for life processes. C. Some energy disappears when living things are eaten. D. Only small amounts of energy can be destroyed at a time.

The correct answer is B. Some of the energy is used for life processes. This is explained by the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred or transformed. When an organism eats another organism, it gains energy from the food. However, not all of this energy is passed on to the next organism in the food chain. Some of it is used by the organism for its own life processes, such as movement, growth, and reproduction. This energy is then lost as heat to the environment. Therefore, with each step up the food chain, the amount of available energy decreases.