A grass starts with 30,000 kJ of energy. How much energy would a cheetah acquire after it ate a zebra that consumed the grass?

About 10% of energy transfers from one trophic level to the next. The zebra gets about 3,000 kJ from the grass, and the cheetah gets about 10% of that, or 300 kJ, so the correct choice is 300 kJ.

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