7.4 Trophic levels in an ecosystem (biology only)

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Question 6
Easy

Figure 1 shows how the mean dry biomass of zooplankton in a lake ecosystem changed between 1995 and 2025.

Figure 1: Mean dry biomass of zooplankton in a lake ecosystem

Calculate the percentage decrease in the mean dry biomass of zooplankton between 1995 and 2010.

Give your answer to the nearest whole number.

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7.4 Trophic levels in an ecosystem (biology only) Questions

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