Interpret the food chain: producer - pear tree, primary consumer - aphids, secondary consumer - ladybirds, tertiary consumer - partridge.
Tree is much large than an aphid - lots of aphids feeding on a few trees. Many ladybirds eating the aphids. A few partridges eating the ladybirds. Biomass & energy decreasing as you ascend levels, tree can fix some of Sun's energy using its leaves.
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