Energy Flow and the 10% Rule Practice Test

A chain is: grasses → grasshoppers → frogs → snakes. If snakes have $9\ \text{kJ}$ available, approximately how much energy is available to frogs?

A food chain has four trophic levels: producers → primary consumers → secondary consumers → tertiary consumers. If producers contain $200{,}000\ \text{kJ}$, approximately how much energy is available to secondary consumers?