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The pyramid which cannot be inverted in a stable ecosystem is that of

1. Biomass
2. Number
3. Energy
4. All the above

Correct answer: Energy

Solution

The pyramid of energy is always upright because energy is lost as heat at every trophic level, so higher levels can never contain more energy than lower ones. Biomass and number pyramids can be inverted in some ecosystems, but energy cannot.

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