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The orcas of Puget Sound feed primarily on salmon, whose numbers have been declining. Salmon feed on krill, which feed on phytoplankton. Data is provided on the energy transferred between trophic levels, including that 1,700,000 kcal/m2/yr of sunlight is captured by primary producers, of which 8,863 kcal/m2/yr is converted to chemical energy and passed up the food chain. The student must draw the food chain, create a data table, and draw pyramids of number, biomass, and energy while evaluating patterns of t

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