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SNC 1D/P Ecological Pyramids food chains: only indicate the number of trophic levels (energy transfers), not how much energy is available ex. grass grasshopper mole ecologists prefer to study ecological pyramids owl 3 types 1. pyramid of numbers: the area of each rectangle represents the ___________________________________ that trophic level tree grasshopper mole owl tree grasshopper mole owl fleas advantage: disadvantage: 2. pyramid of biomass: the area of each rectangle represents the ________________________________ at that trophic level advantage: disadvantage: 3. pyramids of energy: the area of each rectangle represents the ________________________________ at that trophic level advantage: disadvantage: