A freshwater lake ecosystem has a total primary production of 20,000 kcal. Zooplankton, which are primary consumers, feed on the phytoplankton. Small fish, which are secondary consumers, feed on the zooplankton. Larger fish, which are tertiary consumers, feed on the small fish. How much energy would be available to the tertiary consumers according to the 10% energy rule? 200 20,000 20 2,000 0 2

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